Identify Proportional Equations

What is the constant of proportionality in the equation y = 7x?

• y

• x

• 7

If a car travels 60 miles in 2 hours, what is the constant of proportionality that describes the relationship between distance (y) and time (x)?

• 30

• 20

• 40

• 50

Apples cost $3 per kilogram. Which equation best represents y, the total cost of x kilograms of apples?

• x = 3y

• y = 3x

• y = 3 - x

• y = 3 + x

The constant of proportionality is also the unit rate.

• True

• False

Does this equation represent a proportional relationship?

• Yes

• No

Select ALL equations that are proportional.

• y = 3x

• y = 25x

• y = 7x

• y = 2x - 1

• y = 4000x

What is the formula for a proportional relationship?

• y=kx

• y=k/x

• z=ykx

• y=ky

What does k represent in the equation y = kx?

• constant rate of change

• constant of proportionality

• the equation

• x/y

What is the constant of proportionality in the equation y = 14x ? 

• y

• x

• 14

Identify the constant of proportionality.

• k = 2

• k = 4

• k = 1/2

• k = 1/4

• none (not proportional)