Direct Variation

Does the relationship represent direct variation?

• Yes

• No

Which of the given graphs is a direct variation?

• A

• B

• C

• D

Do x and y show direct variation?

y = 5x

• Yes

• No

Is this the graph of a direct variation?

• Yes

• No

Which is an example of direct variation?

• xy = 10

• y = 5x

The letter k in the equation y = kx stands for

• the constant of proportionality

• king

• queen

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

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

In a direct variation, y = 39 when x = 3. 
Find the value of y when x = 2.

• 26

• 3

• 58.5

• 2

The number of kilograms of water in a person’s body varies directly as the person’s mass.  A person with a mass of 90 kg contains 60 kg of water.  How many kilograms of water are in a person whose mass is 75 kg?

• 50 kg water

• 72 kg water

• 94 kg water

• 150 kg water