Direct Variation Review

What type of relationship is a direct variation.

• proportional

• non-proportional

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

What is the constant of proportionality, k, for the given graph?

• k = 15

• k = 5

• k = 3

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

• 88/3

• 28

• 66/4

• 24

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

• 4/5

• 17

• 16

• 25

What is the direct variation equation?

​ (a)   = ​ (b)   ​ (c)  

• y

• k

• x

• z

• p

• q

• a

• b

• d

• f

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

• Yes

• No

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