Direct Variation Problems

Heather’s weekly pay varies directly with the number of hours that she works at the record store. Heather is paid $174 for 24 hours of work. Find the amount of pay for 40 hours of work.

Hint: Set up a proportion

• $960

• $250

• $300

• $290

A person’s weekly pay varies directly to the number of hours worked. Shawn’s pay is $123.00 for 20 hours of work. What would Shawn’s pay be if he worked for 31 hours?

Hint: Set up a proportion

• $180.50

• $620.00

• $190.65

• $210.75

The amount of water a dishwasher uses varies directly with the number of loads of dishes it washes. If a dishwasher uses 65 gallons of water to wash 5 loads of dishes, it uses _____ gallons of water to wash 12 loads of dishes.

Tags

TEKS.MATH.7.4C

TEKS.MATH.7.4A

y varies directly as x. If x = 5 when y = 12, find x when y = 30. Hint: Set up a proportion.

• 15

• 10

• 12.5

• 20

Mathematical Equivalence

ON

a relationship between two variables in which the data increases or decrease together at a constant rate

• direct variation or proportional

• indirect variation

• variation

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

If x and y vary directly, as y increases, what happens to the value of x? ​ (a)  

• increases

• decreases

• does nothing

Tags

A.8

For direct variation, you ______.

• Add

• Subtract

• Multiply

• Divide