212 Chapter 3 Graphing Linear Equations in Two Variables 11. y0.2x 0.04 Window: 0.1 x 0.3 0.1 y 0.1 Xscl 0.01 (sets the x-axis tick marks to increments of 0.01) Yscl 0.01 (sets the y-axis tick marks to increments of 0.01) 12. y 0.3x – 0.5 Window: 1 x 3 1 y 1 Xscl 0.1 (sets the x-axis tick marks to increments of 0.1) Yscl 0.1 (sets the y-axis tick marks to increments of 0.1) 3. 4. 5. 6. 7. 8. y 3 4 x 4x 7y 21 2x 3y 12 3x 4y 6 5x 4y 10 For Exercises 9–12, graph the equations on the given viewing window. 9. y 3x 15 Window: 10 x 10 10. Window: 5 y 20 y 2x 25 30 x 30 30 y 30 Xscl 3 (sets the x-axis tick marks to increments of 3) Yscl 3 (sets the y-axis tick marks to increments of 3) 5 3 y 1 2 x 7 2 Section 3.2 Practice Exercises Study Skills Exercise Check your progress by answering these questions. Yes No Did you have sufficient time to study for the test on Chapter 2? If not, what could you have done to create more time for studying? Yes No Did you work all of the assigned homework problems in Chapter 2? Yes No If you encountered difficulty, did you see your instructor or tutor for help? Yes No Have you taken advantage of the textbook supplements such as the Student Solutions Manual? Vocabulary and Key Concepts 1. a. A linear equation in two variables is an equation that can be written in the form where A and B are not both zero. b. A point where a graph intersects the x-axis is called a(n) . c. A point where a graph intersects the y-axis is called a(n) . d. A line can be represented by an equation of the form x k, where k is a constant. e. A line can be represented by an equation of the form where k is a constant. Review Exercises For Exercises 2–8, refer to the figure to give the coordinates of the labeled points, and state the quadrant or axis where the point is located. 2. A 3. B 4. C 5. D 6. E 7. F 8. G y k, 5 4 3 2 1 D G 2524 23 2221 1 2 3 4 5 21 22 23 24 25 A B C y x E F
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