Constant of Proportionality and Unit Rates

Write an equation for this relationship.

• y = 18x

• y = 18.50x

• y = 22.50x

• y = 22x

Determine the constant of proportionality for the table. Express your answer as y = kx

• y = 30k

• y = 30x

• y = 0.03x

• y = 9x

You can buy 36 cookies for $4. What is the unit rate (in cookies per dollar)?

• 4 cookies per dollar

• 6 cookies per dollar

• 9 cookies per dollar

• 1/9 dollars per cookie

You spend $40 on 5 pounds of concrete. What is the unit rate in dollars per pound?

• $8 per pound

• $5 per pound

• $35 per pound

• 0.125 pounds per dollar

Find the unit rate.

• $360 per hour

• 40 hours per dollar

• $10 per hour

• $9 per hour

Elijah earn $200 for 8 hours of work. What is the unit rate (in dollars per hour)?

• $50 per hour

• $12 per hour

• $192 per hour

• $25 per hour

What has to be true about a unit rate?

• It must be written as a fraction.

• It must be written as a decimal.

• It is always "per" one thing.

• It is used to measure area in square units.

Which of these is not a unit rate?

• 70 miles per hour

• $15 per pound

• 15 pages per 20 minutes

• 1000 meters per kilometer

Find the unit rate

• $3.50 per hour

• $7 per hour

• 5 hours per dollar

• $14 per hour

Find the unit rate.

• 5 minutes per word

• 10 words per minute

• 15 words per minute

• 20 words per minute