Direct Variation

In an equation, y varies directly as x varies. If y = 72, when x = 12, what is the value of y when x = 8?

• 6

• 8

• 576

• 48

The number of cookies Sadie can make varies directly with the amount of time she spends making the cookies. She can make 4 cookies in 1/2 hour. How many cookies can Sadie make in 5 hours?

• 10

• 2

• 40

• 2.5

Tags

CCSS.6.RP.A.3B

• 168.75

• 2.25

• 37.5

• 337.5

In an equation, y varies directly as x varies. If y= -40 when x=5, what is the value of x when y=-4?

• 1/2

• -1/2

• 1/4

• 40

• 4.5

• 16

• 24

• 32

• 15.6

• 21.6

• 26.8

• 37.4

• 2

• -2

• 18

• -18

Write the equation for the table given.

• y = 1/3x
• y = 3x
• y = 1/2x

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

What is the constant of variation?

• 45

• 90

• 135

• 2

A person’s weekly pay is directly proportional to the number of hours worked. Shawn’s pay is $123.00 for 20 hours of work. What is the equation of variation?

• y = 123x
• y = 20x
• y = 6.15x
• y = 0.16x

Tags

CCSS.6.EE.B.6

CCSS.6.EE.C.9

CCSS.6.RP.A.2

CCSS.6.RP.A.3