Direct Variation Review

Which of the following is the equation format for direct variation?

• y = mx + b

• y = kx

Does the given graph show a direct variation?

• Yes

• No

Is the given relationship shown in the graph a direct variation?

• Yes

• No

Y varies directly as x. If y = 12 when x = 15, what is y when x = 20?

• 4/5

• 17

• 16

• 25

n varies directly with c. If c = 24 when n = 18, what is c when n = 22?

• 88/3

• 28

• 66/4

• 24

When y = 12, x = 6. If y varies directly with x, what is the value of y when x = 18?

• y = 2

• y = 9

• y = 36

• y = 24 

When y = 15, x = 3. If y varies directly with x, what is the value of y when x = 7?

• y = 5

• y = 35

• y = 21

• y = 105

When y = 8, x = 2. If y varies directly with x, what is the value of x when y = 16?

• x = 4

• x = 64

• x = 32

The number of pieces of Starburst varies directly as the number of packages. There are 36 pieces of Starburst in 2 packages. Suppose you have 5 packages of Starburst. Which of the following is the equation for the given situation?

• y = 18x

• y = 2.5x

The number of pieces of Starburst varies directly as the number of packages. There are 36 pieces of Starburst in 2 packages. Suppose you have 5 packages of Starburst. How many pieces of Starburst would you have?

• 90

• 18

• 180

• 72