1. Test Review: Direct Variation

2. Rewrite the direct variation equation, y = kx, in terms of “k.” In other words, k = _________. Test Review: Direct Variation

3. Solve for x: Test Review: Direct Variation

4. Using y = 7x, what is the value of x if y = 56? Test Review: Direct Variation

5. Referring to the table below, use a proportion to predict Michael’s numerical grade on Test #3. Test #Hours Studied Test Grade 11.575 22100 31.2

6. If y varies directly as x, and y = 68 when x = 4, find x when y = 51. Test Review: Direct Variation

7. Complete the following table for y = x. X Y 0 1 2 3 4 Graph the table of values Test Review: Direct Variation

8. 50 45 40 35 30 25 20 15 10 5 A T-shirt cost $3.00. Draw a graph to represent how much 4, 6, 8, and 10 T-shirts would cost. What is the constant of proportionality (k)?____ Test Review: Direct Variation

9. x01234 y Complete the following table for y = 3x

10. Write a proportion to show how you would solve the problem - do not solve: A rose bush grows 4 inches every 3 months. How many inches will the bush grow in 1 year (1 year equals 12 months)? Test Review: Direct Variation

11. Suzy can walk 1 mile in 8 minutes. Create a table of values that represent time and distance. Distance (x) Time (y) 0 3 6 9 What direct variation equation would represent the miles and time that Suzy can walk?________ Test Review: Direct Variation

12. What value of n makes the equations true? Test Review: Direct Variation

13. Which of the given values satisfies the equation y = 6x A.x = 7, y = 42 B. x =4, y = 2 C. x =3, y = 24 D. x = 1.5, y = 5.5 Test Review: Direct Variation

14. The variables x and y vary directly. When x = 13, y = 39. What equation relates x and y? Test Review: Direct Variation

15. a. Using y = 2x, create a table in which x = 0, 1, 2, 3 b. Plot these points on the graph below

16. Johnny scores 24 points in three basketball games. The season has 8 games. How many points can Johnny expect to score by the end of the season? Test Review: Direct Variation

17. Complete the following table for y = 4.5x x 01234 y04.59?18 Test Review: Direct Variation

18. The graph below shows the cost of gasoline per gallon. What is the equation for graph? Test Review: Direct Variation

19. If y varies directly with x, and y = 6 when x = 8, find x when y = 24. Test Review: Direct Variation

20. Which of the following equations is a direct variation? A. y + 15 = x B. x - 2 = y C. 3x = y D. xy = 7 Test Review: Direct Variation

21. Five packs of gum cost $3.00. At that rate, about how much will 36 packs of gum cost? Test Review: Direct Variation

22. In a direct variation, as the quantity of video games you purchase decreases, what happens to the total cost (your bill) of the video games? Test Review: Direct Variation

23. Which of the following tables represent a direct variation? A. B. C.D. xy 312 624 936 1248 xy 12 23 34 45 xy 241 122 83 64 xy 25 69 1013 1417 Test Review: Direct Variation

24. Which graph represents an direct proportion? a. b. c. d. Test Review: Direct Variation

25. y varies directly with x. If y = 8 and x = 4, what does y equal when x=3? Test Review: Direct Variation

26. Write the direct variation equation for the following table. _________ xy 41 82 123 164 Test Review: Direct Variation