Section 1.3: Graphing Equations

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1 SECTION 1.3 Graphing Equations Section 1.3: Graphing Equations Graphs Intercepts of Graphs Symmetry Circles Graphs Make a table of values and then graph the points from the table. MATH 1310 College Algebra 55

2 CHAPTER 1 An Introduction to Graphs and Lines Make a table of values and then graph the points from the table. Make a table of values and then graph the points from the table. 56 University of Houston Department of Mathematics

3 SECTION 1.3 Graphing Equations Additional Example 1: MATH 1310 College Algebra 57

4 CHAPTER 1 An Introduction to Graphs and Lines Additional Example : 58 University of Houston Department of Mathematics

5 SECTION 1.3 Graphing Equations Additional Example 3: MATH 1310 College Algebra 59

6 CHAPTER 1 An Introduction to Graphs and Lines Additional Example 4: 60 University of Houston Department of Mathematics

7 SECTION 1.3 Graphing Equations Intercepts of Graphs MATH 1310 College Algebra 61

8 CHAPTER 1 An Introduction to Graphs and Lines Additional Example 1: 6 University of Houston Department of Mathematics

9 SECTION 1.3 Graphing Equations Additional Example : MATH 1310 College Algebra 63

10 CHAPTER 1 An Introduction to Graphs and Lines Additional Example 3: 64 University of Houston Department of Mathematics

11 SECTION 1.3 Graphing Equations Symmetry MATH 1310 College Algebra 65

12 CHAPTER 1 An Introduction to Graphs and Lines 66 University of Houston Department of Mathematics

13 SECTION 1.3 Graphing Equations Example Problem: MATH 1310 College Algebra 67

14 CHAPTER 1 An Introduction to Graphs and Lines Additional Example 1: 68 University of Houston Department of Mathematics

15 SECTION 1.3 Graphing Equations Additional Example : Additional Example 3: MATH 1310 College Algebra 69

16 CHAPTER 1 An Introduction to Graphs and Lines 70 University of Houston Department of Mathematics

17 SECTION 1.3 Graphing Equations Additional Example 4: MATH 1310 College Algebra 71

18 CHAPTER 1 An Introduction to Graphs and Lines Circles 7 University of Houston Department of Mathematics

19 SECTION 1.3 Graphing Equations MATH 1310 College Algebra 73

20 CHAPTER 1 An Introduction to Graphs and Lines Additional Example 1: Additional Example : 74 University of Houston Department of Mathematics

21 SECTION 1.3 Graphing Equations Additional Example 3: MATH 1310 College Algebra 75

22 CHAPTER 1 An Introduction to Graphs and Lines 76 University of Houston Department of Mathematics

23 SECTION 1.3 Graphing Equations Additional Example 4: MATH 1310 College Algebra 77

24 Exercise Set 1.3: Graphing Equations Determine which of the following points are on the graph of the given equation x + y = 5; (1, 4), (3, - 7), (, ) 5. x y = 7; (0, -5), (-3, -13), (, - ) 3. xy x + 3 y = 7; (, -5), (-1, 3), ( 6, ) 4. x y = x + y; (3, ), (5, 4), (-7, - 6) 5. x y(3 + xy) = x + 5; (1,1), (-, 3), (-5,0) 6. y ( x xy) = 40; (4, -1), (-3, - ), ( 3, -5) Sketch the graphs of the following equations by plotting points. 7. y = x 5 8. y = 3 x y = x y = x y = x 1. y = x y = 3 x 3 y = x 1 y = x 8 y = x Find the x- and y-intercepts of the graph of each of the following equations. 17. y = 4x y = 3x x + y = x 4y = 4 1. y = x 16. x = 5 y y = x 4. xy = 6 5. y = x y = x x + y = x y = 9 9. x + xy + 3y = x 5xy + 3y = 36 In the following questions, only part of the graph is given. Complete each graph using the given symmetry. 31. x-axis 3. y-axis 33. origin 34. x-axis University of Houston Department of Mathematics y y y y x x x x

25 Exercise Set 1.3: Graphing Equations Test the following equations for symmetry with respect to the x-axis, the y-axis, and the origin. Identify the center and radius, and then sketch the graph of the equation y = x + x x = y + y 3 y = 5x x + y = x + y = ( x ) + ( y + 3) = y = x 4 5x + x y = y x y = xy 41. y = 3x + 5x 4. x + y = 5y 43. x + 3 y = x 7 y = 4 For each of the following equations: (a) Test the equation for symmetry. (b) Find and plot the intercepts. (c) Plot a few intermediate points in order to complete the graph. (Keep symmetry in mind to minimize the length of this step.) 45. y = x ( x + ) + ( y 4) = 4 Write an equation of the circle that satisfies the given conditions. 59. Center (-4, -3); radius Center (7, 0); radius Center (-, 5); radius 7 6. Center at the origin; radius Endpoints of a diameter are (-3, 6) and (5, ) 64. Endpoints of a diameter are (5, -3) and (-9, 11) 65. Center (, 5); passes through (-6, 4) 66. Center (-3, 1); passes through (5, -) 67. Center (-,4); tangent to the x-axis. 68. Center (3, -1); tangent to the y-axis. Write an equation for each of the following circles y = 5 x y = y = 9 x 5 x y x y = x 4x 50. y = x + 3 The following equations represent circles. Identify the center and radius of each circle. 51. ( x 3) + ( y + 5) = ( x + 7) + ( y 1) = x + ( y 6) = ( x + 8) + y = y x MATH 1310 College Algebra 79

26 Exercise Set 1.3: Graphing Equations Show that the following equations represent circles by writing them in standard form: ( x h) + ( y k) = r Then identify the center and radius of the circle. 71. x + y + 4x 1y 9 = 0 7. x + y x + 8y 0 = x + y 10y + 1 = x + y 14x + 39 = x + y + x 6y + 7 = x + y x + y = 0 80 University of Houston Department of Mathematics

1.2 GRAPHS OF EQUATIONS. Copyright Cengage Learning. All rights reserved.

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