Solving Problems Involving Direct Variation

In a direct variation, the value of y = 39 when x = 3. Find the value of y when

x = 2.

• 26

• 3

• 39

• 2

Tags

CCSS.7.RP.A.2

CCSS.7.EE.B.4

y varies directly with x,

y is 16 when x is 32.

Which equation represents this situation?

• y = 32x

• y = 16x

• y = 2x

• y = (1/2)x

Tags

CCSS.7.RP.A.2

CCSS.7.EE.B.4

If y varies directly with x and y = 4 when x = -4, find y when x =7.

• 4

• 7

• -7

• -4

Tags

CCSS.7.RP.A.2

CCSS.7.EE.B.4

If y varies directly with x and y = 15 when x = 12. Which equation represents this situation?

• y = (5/4)x

• y= (4/5)x

• y= 4x

• y= 5x

Tags

CCSS.7.RP.A.2

CCSS.7.EE.B.4

The amount of money earned on a job is directly proportional to the number of hours worked. If $70.00 is earned in 5 hours, how much money is earned in 22 hours of work?

• $2

• $308

• $1.57

• $265

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

CCSS.7.EE.B.3

Trina's paycheck earnings varies directly as the number of hours she works. If she works 19 hours and earns $187.15, what should she earn if she worked 40 hours?

• $394

• $440

• $472.80

• $512.20

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

CCSS.7.EE.B.3

CCSS.7.NS.A.2

CCSS.7.NS.A.3

The amount of money earned on a job is directly proportional to the number of hours worked. if $36 is earned for 8 hours of work, how much is earned for 30 hours of work?

• $135

• $6.67

• $1080

• $532

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

y varies directly with x,

and y is 84 when x is 16.

Which equation represents this situation?

• y = 1344x

• y = 100x

• y = 5.25x

• y = (4/21)x

Tags

CCSS.7.RP.A.2

CCSS.7.EE.B.4

CCSS.7.RP.A.3

Suppose y varies directly as x.

If y = 22.5 when x = 15, find y when x = 20.

• 1.5

• 337.5

• 30

• 16.875

Tags

CCSS.7.RP.A.2

CCSS.7.EE.B.4

CCSS.7.RP.A.3

CCSS.7.NS.A.2

y varies directly with x,

and y is 84 when x is 16.

What is the constant of proportionality?

• k = (21/4)x

• k = 21

• k = 5.25

• k = 4/21

Tags

CCSS.7.RP.A.2

CCSS.7.EE.B.4