Direct Variation Test

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. Find the amount of pay for 31 hours of work. 

• $3813

• $620

• $190.65

• $4.96

Is this proportional?

• yes

• no

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

• y = mx + b

• y = kx

Suppose y varies directly as x. If y = -7 when x = -14, find x when y = 10.

• -5

• 3

• 9.8

• 20

Suppose y varies directly as x. If y = 3 when x = 15, find x when y = 5.

• 25

• 17

• 9

• 1

The number of books sold varies directly as the cost of the books. If 8 books cost $10.40, how many books can be bought for $32.50?

• 25 books

• 30 books

• 32 books

• 42 books

Suppose y varies directly as x. If y = 150 when x = 3, find y when x = 5.

• 0.1

• 90

• 153

• 250

What ordered pair does a direct variation always go through when graphed?

• (0, 0)

• (1, 0)

• (0, 1)

• (1, 1)

What is the equation to find "k", the constant of proportionality?

• y = kx

• y = mx + b

The phrase "y varies directly with x" means a relationship is a direct variation.

• True

• False