Direct Proportion Review

Suppose y varies directly with x. If y=3 when x=10.5, what is y when x=63?

• y = 18

• y = 55.5

• y = 221

• y = 3.5

The cost of apples varies directly with the number of pounds purchased. Using the table, find the unit price.

• $3.36/pound

• $1.68/pound

The variable "k" in the equation "y=kx" represents which of the following?

• The constant of proportionality

• The unit rate

• The 11th value in a sequence of numbers

Marcus runs 5.6 miles every two days. Which proportion or equation below could be used to solve for the number of miles he would run in eleven days?

•  $\frac{2}{5.6}=\frac{11}{x}$​=x11​  

Based on this graph, which of the following are true? Select all that apply.

• This graph is a proportional relationship because it is linear and reaches (0,0).

• The unit rate is 10 meters per second.

• The direct variation equation is y = 10x.

• According to this graph, the object would travel 60 meters in 60 seconds.

If Craig buys 4 umbrellas for $50.36, what is the unit price?

• $50.36

• y=50.36x

• $12.59

• 0.08 umbrellas/dollar

• y=12.59x

• x = 13.5

• x = -108

• x = 1.5

• x = 3

Casey made $171.50 for 14 hours of work last week. This week she earned $98. How many hours did she work this week if she was paid the same rate both weeks?

• 12.25 hours

• 8 hours

• 7 hours

• 1.75 hours

Sheryl walks at a steady pace. Which equation represents her total time spent walking depending on the number of miles she walks at that pace?

• y = x + 13

• k = 65/5

• y = 13x

Y varies directly as x. If y = 12 when x = 15, what is y when x = 20?

• 4/5

• 17

• 16

• 25