MATH 9 - SUMMATIVE TEST - Q2

1. Which of the following equations is an example of direct variation?

• A. 3y = 6x + 1

• B. 2y = 12x

• C. 2y + x = 7

• D. All of the choices

2. Which relationship is a direct variation?

• A. x = 1, 2, 3, 4 and y = -1, 0, 1, 2

• B. x = 1, 2, 3, 4 and y = 3, 5, 7, 9

• C. x = 1, 2, 3, 4 and y = 0, -1, -2, -3

• D. x = 1, 2, 3, 4 and y = 3, 6, 9, 12

3. Which equation is an example of joint variation, where k is the constant of variation?

• A. y = x/kw

• B. y = kx/w

• C. y = kxw

• D. y = k/xw

4. Which formula describes the variation, “ v varies directly as t and inversely as w”?

• A. v = kt/w

• B. v = k/t

• C. v = 8t

• D. v = 8/t

5. What is the equation of the variation, ” y is inversely proportional to x” and x = 12, when y = 3?

• A. y/x = 36

• B. y = 12/3

• C. y = 36/x

• D. 12 = 3/y

6. Which of the following equations describes a combined variation, where k is the constant of variation?

• A.W = kab

• B. W = kab/c

• C. W = kabc

• D. W = k/ab

7. What is the constant of variation in the equation, y = 10x ?

• A. 10

• B. 10x

• C. x

• D. y

8. What happened to D ,when R is doubled in the equation, D = 5R ?

• A. D becomes zero

• B. D is halved

• C. D is doubled

• D. D is tripled

9. Which is an example of direct variation ?

• A. Y = 10

• B. y = 2/x

• C. y = 5x

• D. 2/y = x

10. Which variation is described in the sentence,” A car travels a distance d km in t hr ” ?

• A. direct

• B. inverse

• C. joint

• D. combined