Constant Rate of Proportion

Cheddar Cheese cost $4.25 per pound. Which equation best represents y, the total cost of x pounds of cheddar cheese?

• x = 4.25y

• y = 4.25x

• y = 4.25 - x

• y = 4.25 + x

The graph represents the linear relationship between the number of books Layla has read and the number of months she has been a member of a book club. Which of these statements is supported by the rate of change of this relationship?

• Layla read 2 books in the first 3 months she was a member of the book club.

• Layla read 3 books in the first 2 months she was a member of the book club.

• Layla read 3 books in the first 4 months she was a member of the book club.

• Layla read 4 books in the first 3 months she was a member of the book club.

A worker uses 450 inches of steel wire to make 300 springs the same size. At this rate how many inches of steel wire are needed to make 1 spring?

Identify the constant of proportionality.

• k = 2x

• k = 2

• k = 4

• none

40 CALORIES PER MIN.

15 CALORIES PER MIN.

4 CALORIES PER MIN.

60 CALORIES PER MIN.

• 40 CALORIES PER MIN.

• 15 CALORIES PER MIN.

• 4 CALORIES PER MIN.

• 60 CALORIES PER MIN.

Does the table below represent a constant rate of change? If yes, what is it?

• Yes, k = 1

• Yes, k = 6

• Yes, k = - 6

• No, the table does NOT show a proportional relationship.

What is the constant of proportionality?

• $3

• $4

• $2

• $9

What is the constant of proportionality?

• 7

• 14

• 10

• 21

Name the constant of proportionality.

• 20

• 40

• 16

• 35

• 1 minute per day
• 2 minutes per day
• 3 minutes per day
• 15 minutes per day