1. Math 7 Unit 6
Test Review

2. 1. Which equation represents a direct variation?
xy = 4
y = 4/x
y = 4x
y = 4 + x

3. 2. Which equation represents an inverse variation?
y = x + 4
y = 4x
y = 4 – x
y = 4/x

4. x y 1 6 2 3
Does the table of values represent a direct variation, inverse variation or neither?
Direct
Inverse
Neither

5. 4. Does the table of values represent a direct variation, inverse variation or neither?x y 2 3 1 6
6/5 5
Direct
Inverse
Neither

6. Do the following coordinates represent a direct variation, inverse variation or neither? (2,12); (3, 8); (-6, -4); (4, 6)
Direct
Inverse
Neither

7. Y varies inversely as x. When x = 3, then y = 12
Y varies inversely as x. When x = 3, then y = What is the value of y when x = 4? 16 36 1 9

8. 7. Which describes the graph of a direct proportion?
Straight line in quadrant I only
Straight line going through the origin
Curve (hyperbola) that never crosses either x or y
Curve (hyperbola) that crosses through the origin

9. 8. Which describes the graph of an inverse variation?
Straight line in quadrant I only
Straight line going through the origin
Curve (hyperbola) that never crosses either x or y
Curve (hyperbola) that crosses through the origin

10. 9. The school board has $2,000,000 to use for school supplies
9. The school board has $2,000,000 to use for school supplies. If they give each school an equal amount, how do they decide how much money each school gets?
Take $2,000,000 and divide it by how many schools there are
Take the number of schools and divide that by $2,000,000
Take $2,000,000 and multiply by the number of schools there are

11. 10. What type of variation does the previous situation represent?
Direct
Inverse
Neither

12. 11. John makes $10 for each lawn he mows
11. John makes $10 for each lawn he mows. How can you determine how much money he will make?
Multiply 10 by the number of lawns he mows
Divide the number of lawns he mows by 10
Add 10 to the number of lawns he mows
Divide 10 by the number of lawns he mows

13. 12. What type of variation does the previous situation represent?
Direct
Inverse
Neither

14. 13. If x = 4 and y = 12, and x varies directly with y, what is x when y = 186 3 2 54

15. 14. y varies inversely with x. When x = 10, then y = 2
14. y varies inversely with x. When x = 10, then y = 2. What is y when x = 4
4/5 5 20 8