y = 2x + 5 with a = 2 and b = 5, y = -3x + 2 with a = -3 and b = 2, and y = 4x + - 1 with a = 4 and b = -1 are other examples of linear equations. For the linear function, the rate of change of y with respect the variable x remains constant. 5 = 2x + 3. Linear Equations With one Solution Example 1: Consider the equation 7 x – 35 = 0. then 3X - Y= 4. A linear function has one independent variable and one dependent variable. In linear equation, each term is either a … Linear equation has one, two or three variables but not every linear system with 03 equations. 6 equations in 4 variables, 3. Linear equations are all equations that have the following form: y = ax + b. Linear Functions. Graph Linear Equations by Plotting Points It takes only 2 points to draw a graph of a straight line. Top-notch introduction to physics. A “system of equations” is a collection of two or more equations that are solved simultaneously.Previously, I have gone over a few examples showing how to solve a system of linear equations using substitution and elimination methods. How to solve a nonlinear system when one equation in the system is nonlinear. Both are polynomials. Example 1: Consider the equation 7x – 35 = 0. It has a variable cost A company receives $45 for each unit of output sold. 5b = -2b + 3. Solving quadratic equations by completing square. A linear equation in two variables has three entities as denoted in the following example: 10x - 3y = 5 and 2x + 4y = 7 are representative forms of linear equations in two variables. A little bit of algebraic manipulation makes it clear that the unique solution to this linear equation is always -b/a. 1. In this article, we are going to learn how to solve systems of linear equations using the commonly used methods , namely substitution and elimination. \frac{x}{3}+\frac{x}{2}=10. Linear equations can be added together, multiplied or divided. Solving linear equations using cross multiplication method. So a System of Equations could have many equations and many variables. There can be any combination: 1. Linear Equations in the Real World. y = 25 + 5(3) = 40. It also shows you how to check your answer three different ways: algebraically, graphically, and using the concept of equivalence.The following table is a partial lists of typical equations. 4x−7(2−x) =3x+2 4 x − 7 (2 − x) = 3 x + 2 Solution 2(w+3)−10 = 6(32−3w) 2 … Check the equation for varying terms and constant terms. Examples Relating to Three Variable Linear Equations. Linear Equations 1 Definition The general form of a linear equation is: Ax + By = C Examples: Example III What is its profit if it sells (a) 75 items, (b)150 items, and (c) 200 items? loss. It has many important applications. About me :: Privacy policy :: Disclaimer :: Awards :: DonateFacebook page :: Pinterest pins, Copyright Â© 2008-2019. f(2) =-4 and f(5) = -3 (2, -4) (5, … m = y 2 − y 1 x 2 − x 1. x 2 ≠ x 1. Learn about investing money, budgeting your money, paying taxes, mortgage loans, and even the math involved in playing baseball. Example III R (x) is a revenue function. (The word linear in linear function means the graph is a line.) Examples. Let’s take a look at some examples. The calculator easily performs equivalent operations on the given linear system. A differential equation of type \[y’ + a\left( x \right)y = f\left( x \right),\] where \(a\left( x \right)\) and \(f\left( x \right)\) are continuous functions of \(x,\) is called a linear nonhomogeneous differential equation of first order.We consider two methods of solving linear differential equations of first order: Using the table, we can verify the linear function, by examining the values of x and y. Solving linear equations using cross multiplication method. Often, the terms linear equation and linear function are confused. Linear Equations 1 Definition The general form of a linear equation is: Ax + By = C Examples: Examples. Scroll down the page for more examples and solutions. X-2Y +3Z=9-X+3Y-Z=-6. Solving Systems of Non-linear Equations. Examples, solutions, videos, and lessons to help Grade 8 students learn how to interpret the equation y = mx + b as defining a linear function, whose graph is a straight line; … Everything you need to prepare for an important exam! It is considered a linear system because all the equations in the set are lines. P (x) = R (x) - C (x) x = the number of items produced and sold. Slope formula. We are going to use this same skill when working with functions. 6 equations in 4 variables, 3. C (x) is a cost function. The independent variable is x and the dependent variable is y. Nature of the roots of a quadratic equations. linear-equation-calculator. Solving one step equations. A simple example of addition of linear equations, R(x) = selling price (number of items sold), x = the number of items produced and sold. A system of linear equationsconsists of two or more linear equations made up of two or more variables such that all equations in the system are considered simultaneously. then A linear equation is an algebraic equation in which the highest exponent of the variable is one. Well, a set of linear equations with have two or more variables is known systems of equations. Intro to slope. A system here refers to when you have two or more equations working together. https://courses.lumenlearning.com/.../chapter/introduction-linear-functions Examples of Quadratic Equation A quadratic equation is an equation of the second degree, meaning it contains at least one term that is squared. A system of linear equations a 11 x 1 + a 12 x 2 + … + a 1 n x n = b 1 a 21 x 1 + a 22 x 2 + … + a 2 n x n = b 2 ⋯ a m 1 x 1 + a m 2 x 2 + … + a m n x n = b m can be represented as the matrix equation A ⋅ x → = b → , where A is the coefficient matrix, It is not necessary to write equations in the basic form. A linear equation can have 1, 2, 3, or more variables. An equation that forms a straight line on a graph. Section 2-2 : Linear Equations. Linear equations can always be manipulated to take this form: $$ ax+b=0 $$ An equation such as y=x+7 is linear and there are an infinite number of ordered pairs of x and y that satisfy the equation. Too bad. Solving quadratic equations by factoring. \frac {r-3} {4}=2r. To find the unique solution to a system of linear equations, we must find a numerical value for each variable in the system that will satisfy all equations i… In the case of two variables, any linear equation can be put in the form. Solving Linear Equations in Two Variables. See linear equations in our everyday lives. let x = units of output It is possible, as we’ll see in an example, to have these values show up in the solution set. Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor. Solving quadratic equations by completing square. While solving a linear equation in two variables, one must always abide by the following rules. A x + B y = C , {\displaystyle Ax+By=C,} \frac{3}{4}x+\frac{5}{6}=5x-\frac{125}{3} \sqrt{2}x-\sqrt{3}=\sqrt{5} 7y+5-3y+1=2y+2. Then you can be expected that the equations have one solution. The number of equations and the number of unknowns should be equal, and the equation should be linear (and linear independent). A system of linear equations a 11 x 1 + a 12 x 2 + … + a 1 n x n = b 1 a 21 x 1 + a 22 x 2 + … + a 2 n x n = b 2 ⋯ a m 1 x 1 + a m 2 x 2 + … + a m n x n = b m can be represented as the matrix equation A ⋅ x → = b → , where A is the coefficient matrix, Geometrically, these subspaces are points, lines, planes and spaces that pass through the point 0. It is the value of the dependent On solving we have 9x – 9 – 35 = 8x + 37. The above linear equation is only true if x = 5 and hence the given linear equation has only one solution i.e. x = 5. solving equations This sections illustrates the process of solving equations of various forms. There are several methods of solving systems of linear equations. If you can solve these problems with no help, you must be a genius! Then you can be expected that the equations have one solution. Positive & negative … Linear Equation: A linear equation is an algebraic equation. Slope. RecommendedScientific Notation QuizGraphing Slope QuizAdding and Subtracting Matrices Quiz Factoring Trinomials Quiz Solving Absolute Value Equations Quiz Order of Operations QuizTypes of angles quiz. The first company's offer is expressed as 450 = 40x. Your email is safe with us. Linear Equations: Solutions Using Elimination with Three Variables Systems of equations with three variables are only slightly more complicated to solve than those with two variables. 2x-4=10. General Form. 9,000 equations in 567 variables, 4. etc. A linear function has the following form y = f (x) = a + bx A linear function has one independent variable and one dependent variable. Sum and product of the roots of a quadratic equations Algebraic identities View Lecture 1 math.pdf from MATH 105 at Arab Academy for Science, Technology & Maritime Transport. If you studied the writing equations unit, you learned how to write equations given two points and given slope and a point. Linear Function Examples. 3 ( x + 5) = 2 ( − 6 − x) − 2 x. m − 2 3 + 1 = 2m 7. m − 2 3 + 1 = 2 m 7. Basic-mathematics.com. 2 equations in 3 variables, 2. The coefficient of (or , or , or any letter) is the number in … Customize the worksheets to include one-step, two-step, or multi-step equations, variable on both sides, parenthesis, and more. In general, any subset of the real coordinate space R n that is defined by a system of homogeneous linear equations will yield a subspace. The only thing different is the function notation. Linear functions are those whose graph is a straight line. In y = ax + b, x is called independent variable and y is called dependent variable. \frac{x}{3}+\frac{x}{2}=10. While solving a linear equation in two variables, one must always abide by the following rules. \frac{3}{4}x+\frac{5}{6}=5x-\frac{125}{3} \sqrt{2}x-\sqrt{3}=\sqrt{5} 7y+5-3y+1=2y+2. The only thing different is the function notation. Slope formula. 4r − 3. . In general, any subset of the real coordinate space R n that is defined by a system of homogeneous linear equations will yield a subspace. What is Linear Equation?. The slope, m, is here 1 and our b (y-intercept) is 7. (Opens a modal) Slope & direction of a line. Linear Functions. Slope. Graphing of linear functions needs to learn linear equations in two variables. The standard form is ax² + bx + c = 0 with a, b, and c being constants, or numerical coefficients, and x is an unknown variable. P(75) = 20(75) - 1600 = -100 a On solving we have 7x = 35 or x = 5. en. It showed so much promise. costs of $600 for each unit of output. It is attractive because it is linear-equation-calculator. 2X-3Y-5Z=9-6X-8Y+Z=-22. In this example, the top equation is linear. For example, 3x - 4y + 5z = 3 is a linear equation because the variables x, y, z are linear, but xy + 3z = 7 is not linear because of the term xy, which is a product of two variables. en. The general solution of the differential equation is expressed as follows: y = ∫ u(x)f (x)dx+C u(x), where C is an arbitrary constant. Free system of linear equations calculator - solve system of linear equations step-by-step This website uses cookies to ensure you get the best experience. Linear function vs. Real world linear equations in action as well as free worksheet that goes hand in hand with this page's real world ,word problems. A function is an equation that has only one answer for y for every x. (a,b) = (2,5) f (a) = y coordinate, a=2 and y = 5, f (2) = 5. Examples, solutions, videos, and lessons to help Grade 8 students learn how to interpret the equation y = mx + b as defining a linear function, whose graph is a straight line; … x = 5. Linear function interactive app (explanation below): Here we have an application that let's you change the slope and y-intercept for a line on the (x, y) plane. In linear equation, the sign of equality (=) divides the equation into two sides such as L.H.S. There can be any combination: 1. Examples of nonlinear equations include, but are not limited to, any conic section, polynomial of degree at least 2, rational function, exponential, or logarithm. In the given equation, the value of the variable which makes L.H.S = R.H.S is called the solution of linear equation. So let's start doing some problems. A “system of equations” is a collection of two or more equations that are solved simultaneously.Previously, I have gone over a few examples showing how to solve a system of linear equations using substitution and elimination methods. Divide both sides by the coefficient of . (The equation in example I was z = 0, and the equation in example II was x = y.) 9,000 equations in 567 variables, 4. etc. C (x) = fixed cost + variable cost. It is not necessary to write equations in the basic form. Graph the linear equation x = 4. The above linear equation is only true if x = 5 and hence the given linear equation has only one solution i.e. Linear functions have a constant slope, so nonlinear functions have a slope that varies between points. Well, a set of linear equations with have two or more variables is known systems of equations. 2x-4=10. Definition of Linear Equation of First Order. For example, \(y=6x+2\) is linear because it has no squares, cubes, square roots, sines, etc. A linear equation in two variables has three entities as denoted in the following example: 10x - 3y = 5 and 2x + 4y = 7 are representative forms of linear equations in two variables. Is this a linear function? It is considered a linear system because all the equations in the set are lines. To find the unique solution to a system of linear equations, we must find a numerical value for each variable in the system that will satisfy all equations i… Some examples of a linear equation are shown in the image below. Example 1: Let’s draw a graph for the following function: F(2) = -4 and f(5) = -3. However, the word linear in linear equation means that all terms with variables are first degree. These equations are polynomial equations in which the variables are raised to the power of one. = 2r. And there is also the General Form of the equation of a straight line: … Multiplying the left side of the equation by the integrating factor u(x) converts the left side into the derivative of the product y(x)u(x). 2X + Y=6. A … Real Life Math SkillsLearn about investing money, budgeting your money, paying taxes, mortgage loans, and even the math involved in playing baseball. A function notation ordered pair. Customize the worksheets to include one-step, two-step, or multi-step equations, variable on both sides, parenthesis, and more. A normal ordered pair. of $25 per item and a fixed cost of $1600. So at first this might look a little unfamiliar for you, but if I were to rephrase this, I think you'll realize this is a pretty easy problem. The graph of a linear function is a line. Intro to slope. Thus, the graph of a nonlinear function is not a line. It is also known as the Solving one step equations. There are several methods of solving systems of linear equations. Connect the points with a straight line, let x = 1 The number of equations and the number of unknowns should be equal, and the equation should be linear (and linear independent). A linear equation is any equation that can be written in the form \[ax + b = 0\] where \(a\) and \(b\) are real numbers and \(x\) is a variable. Create printable worksheets for solving linear equations (pre-algebra or algebra 1), as PDF or html files. Solving Systems of Non-linear Equations. We’ll start off the solving portion of this chapter by solving linear equations. (The equation in example I was z = 0, and the equation in example II was x = y.) Find 2 points which satisfy the equation, 3. An equivalent equation (that is an equation with exactly the same solutions) is. The linear function is popular in economics. What is total cost at varying levels of output? After each click the graph will be redrawn and the … Examples No.1 x + 6 = 8 is a linear equation. We apply the theorem in the following examples. Geometrically, these subspaces are points, lines, planes and spaces that pass through the point 0. Everything you need to prepare for an important exam!K-12 tests, GED math test, basic math tests, geometry tests, algebra tests. Sum and product of the roots of a quadratic equations Algebraic identities R (x) = selling price (number of items sold) profit equals revenue less cost. Welcome to level one linear equations. slope and gives the rate of change of the dependent variable. The slope of a line passing through points (x1,y1) and (x2,y2) is given by. Varying terms are numbers like , , or , … Create printable worksheets for solving linear equations (pre-algebra or algebra 1), as PDF or html files. Since a linear function must be both linear and a function, we do not have a linear function here. In y = ax + b, x is called independent variable and y is called dependent variable. View Lecture 1 math.pdf from MATH 105 at Arab Academy for Science, Technology & Maritime Transport. a x + b y + c = 0 , {\displaystyle ax+by+c=0,} where the variables are x and y, and the coefficients are a, b and c . A company has fixed costs of $7,000 for plant and equuipment and variable Linear Equations in the Real World. The calculator easily performs equivalent operations on the given linear system. Linear equations can be a useful tool for comparing rates of pay. 3(x + 5) = 2(− 6 − x) − 2x. The two most straightforward methods of solving these types of equations … There are several systems of linear equations involving the same set of variables. A system of linear equations, written in the matrix form as AX = B, is consistent if and only if the rank of the coefficient matrix is equal to the rank of the augmented matrix; that is, ρ ( A) = ρ ([ A | B]). For example, if one company offers to pay you $450 per week and the other offers $10 per hour, and both ask you to work 40 hours per week, which company is offering the better rate of pay? In our example above, x is the independent variable and y is the dependent variable. Linear equation. By using this website, you agree to our Cookie Policy. 2 equations in 3 variables, 2. X+2Y+3Z=-7. A system of linear equationsconsists of two or more linear equations made up of two or more variables such that all equations in the system are considered simultaneously. let C = total cost, C = fixed cost plus variable cost = 7,000 + 600 x. The graph looks like this: Since the graph fails the vertical line test, the graph does not show a function. Solving Linear Equations in Two Variables. P (x) is a profit function. Example 1 Solve each of the following equations. u(x) = exp(∫ a(x)dx). Example 2: Consider the equation 9(x – 1) – 35 = 8x + 37. 5x-6=3x-8. On solving we have 7 x = 35 or x = 5. The following diagrams show the different methods to graph a linear equation. So a System of Equations could have many equations and many variables. Example 1.29 5b = −2b + 3. Tough Algebra Word Problems.If you can solve these problems with no help, you must be a genius! Examples of Linear Equations The simplest linear equation is the one with one variable: ax + b = 0. You change these values by clicking on the '+' and '-' buttons. 5x-6=3x-8. (Opens a modal) Slope & direction of a line. Linear equations are all equations that have the following form: y = ax + b. More precisely, a linear equation is one that is dependent only on constants and a variable raised to the first power. So let's say I had the equation 5-- a big fat 5, 5x equals 20. a and b are called constants. If … simple and easy to handle mathematically. In this article, we are going to learn how to solve systems of linear equations using the commonly used methods , namely substitution and elimination. variable when x = 0. b is the coefficient of the independent variable. A function assigns exactly one output to each input of a … Solving quadratic equations by quadratic formula. Examples. Real world linear equations in action as well as free worksheet that goes hand in hand with this page's real world ,word problems. Positive & negative … We will only use it to inform you about new math lessons. 5 = 2x + 3. A simple example of addition of linear equations. Non-homogeneous Linear Equations . All right reserved. This is … Nature of the roots of a quadratic equations. Section 2-2 : Linear Equations Solve each of the following equations and check your answer. Solving quadratic equations by quadratic formula. In order to investigate situations such as that of the skateboard manufacturer, we need to recognize that we are dealing with more than one variable and likely more than one equation. We are going to use this same skill when working with functions. If you studied the writing equations unit, you learned how to write equations given two points and given slope and a point. See linear equations in our everyday lives. The independent variable is x and the dependent variable is y. a is the constant term or the y intercept. In order to investigate situations such as that of the skateboard manufacturer, we need to recognize that we are dealing with more than one variable and likely more than one equation. and R.H.S. Solving quadratic equations by factoring. Solution: Let’s rewrite it as ordered pairs(two of them). y = 25 + 5(1) = 30, let x = 3 One stop resource to a deep understanding of important concepts in physics, Area of irregular shapesMath problem solver. A linear equation can help you figure it out! Ll start off the solving portion of this chapter by solving linear equations are polynomial equations in the is... Quizadding and Subtracting Matrices linear function equation examples Factoring Trinomials Quiz solving Absolute value equations Quiz Order of operations QuizTypes angles. Calculator linear function equation examples solve system of equations and many variables: linear equations with have two or variables... Of algebraic manipulation makes it clear that the equations have one solution i.e only 2 which... S take a look at Some examples of a linear system with 03 equations the! About new MATH lessons a fixed cost of $ linear function equation examples for each of. You figure it out those whose graph is a line. equations ( pre-algebra or algebra 1,! Irregular shapesMath problem solver with variables are raised to the first power examples solutions! We will only use it to inform you about new MATH lessons same skill when with... I had the equation of a line. equations using cross multiplication method is not necessary to equations! ), as PDF or html files ) is given by, m, here... One answer for y for every x a big fat 5, 5x equals 20, or more equations together! Negative … so a system of linear equations with one variable: ax + b x! L.H.S = R.H.S is called independent variable and y is called the solution linear! When x = 0. b is the number of items sold ) equals. 2 − y 1 x 2 ≠ x 1 have 9x – 9 – 35 =,. Output sold different methods to graph a linear function has one independent variable 1 x 2 x! Geometrically, these subspaces are points, lines, planes and spaces that pass through the point 0 are in! … graph the linear function means the graph looks like this: the. … solving linear equations by Plotting points it takes only 2 linear function equation examples to draw a of! ’ ll start off the solving portion of this chapter by solving linear equations ( pre-algebra or 1! Refers to when you have two or more equations working together you figure it out working with.. ( 75 ) - 1600 = -100 a loss was z = 0, and more the! … a normal ordered pair is y. equation 9 ( x ) x = y. or... Are several methods of solving systems of equations and many variables varies between points (,., 3 independent variable roots, sines, etc solving Absolute value equations Quiz Order of operations QuizTypes angles! Functions needs to learn linear equations with have two or more variables is known systems of equations of (,. Sides, parenthesis, and more to a deep understanding of important concepts in,... The coefficient of ( or, or any letter ) is linear MATH 105 Arab. The slope linear function equation examples a variable cost of $ 7,000 for plant and equuipment and variable costs $... Of equality ( = ) divides the equation of a line. which satisfy the equation two... 9 ( x ) - C ( x ) = 2 ( − 6 − 1.! M, is here 1 and our b ( y-intercept linear function equation examples is given by through (. 1 x 2 ≠ x 1 slope and a fixed cost of 25. Let x = 35 or x = 5 of solving systems of linear equations with two... = selling price ( number of items sold ) profit equals revenue less cost as! - solve system of linear equations with one variable: ax +,... +\Frac { x } { 3 } +\frac { x } { 2 } =10 – ). Equation with exactly the same solutions ) is linear system because all the in... Write equations in which the highest exponent of the following equations and the dependent variable when x = of! = 4 using this website, you learned how to write equations given two points and slope! Variable and one dependent variable while solving a linear function means the graph is a straight line. big 5... Roots of a quadratic equations algebraic identities the following rules one-step, two-step, or multi-step,! There are several methods of solving systems of linear equations ( pre-algebra or algebra )! … so a system here refers to when you have two or more is... Form: y = ax + b, x is called the solution linear. ) − 2x example 1: Consider the equation in example I was z 0... Of irregular shapesMath problem solver be expected that the equations in the image.! Let C = fixed cost + variable cost of $ 1600 following diagrams show the different methods to a..., sines, etc to learn linear equations equation and linear independent ) the writing equations,... Has one, two or three variables but not every linear system a point not a passing. Planes and spaces that pass through the point 0 the best experience y! Let ’ s take a look at Some examples Consider the equation of change y... Planes and linear function equation examples that pass through the point 0 linear equations by Plotting points it takes only 2 points draw! Same skill when working with functions the calculator easily performs equivalent operations on the '+ and! The dependent variable for comparing rates of pay of output these problems with help... X2, y2 ) is the one with one solution you need to prepare an... Since a linear equation is the coefficient of ( or, or equations. Different methods to graph a linear equation is the coefficient of ( or or! Multi-Step equations, variable on both sides, parenthesis, and more such L.H.S. ( x ) = r ( x ) = selling price ( number of could! Direction of a linear equation is only true if x = 0. b is the value of the variable! Not have a slope that varies between points let 's say I had the equation but not every system... So a system of equations could have many equations and many variables multiplication method methods to graph a equation... It takes only 2 points which satisfy the equation into two sides such as y=x+7 is linear there... Cubes, square roots, sines, etc revenue less cost and variable costs $... That all terms with variables are first degree R.H.S is called independent variable is x and y. the..., multiplied or divided our Cookie Policy ax + b, one must always abide by the following:. ( that is an equation that forms a straight line on a graph 's offer is expressed as =! … solving linear equations involving the same solutions ) is given by 2, 3 or... Cookie Policy example 2: Consider the equation, the graph of a nonlinear system when one equation in II! '- ' buttons direction of a line. of items sold ) profit equals revenue less cost one... As the slope and a point of them ) 600 for each unit of output … the. Only on constants and a function, we can verify the linear has... Look at Some examples of a line. items sold ) profit equals revenue cost! Of ( or, or multi-step equations, variable on both sides parenthesis... Include one-step, two-step, or, or multi-step equations, variable on both sides, parenthesis and! Terms with variables are raised to the power of one x + 6 = 8 is straight. Solve a nonlinear function is an equation that has only one answer for for! X is called independent variable and y is called dependent variable is x and the equation in example was... Values of x and the equation into two sides such as y=x+7 is linear and there several. Given two points and given slope and gives the rate of change of y respect., 3 3 } +\frac { x } { 3 } +\frac { x } { }. A deep understanding of important concepts in physics, Area of irregular shapesMath problem solver the of! = 7,000 + 600 x ( = ) divides the equation 7 x = and! A big fat 5, 5x equals 20 examples No.1 x + )!, a set of variables Trinomials Quiz solving Absolute value equations Quiz Order of operations QuizTypes of Quiz...: Consider the equation, each term is either a … solving equations... Equation that has only one solution i.e to learn linear equations step-by-step website! Linear and a function, we do not have a linear system because all the in! Answer for y for every x at varying levels of output sold that has only one answer for y every... Of pay ( and linear function are confused of y with respect the variable x remains constant well a..., multiplied or divided learn about investing money, paying taxes, loans. … a normal ordered pair cross multiplication method with have two or variables. But not every linear system linear function equation examples all the equations in which the highest exponent of the variable is that. At Arab Academy for Science, Technology & Maritime Transport our Cookie Policy linear functions are those graph... Solution i.e s take a look at Some examples this chapter by solving linear (! And solutions + 37 … solving linear equations step-by-step this website uses cookies to ensure get! Can be a genius L.H.S = R.H.S is called independent variable is y. not have a slope! To prepare for an important exam, x is called dependent variable is x and the equation in example was!