Constant of Proportionality

y=kx.  What does the k represent?

• constant of proportionality
• Kittens

• Kindness

• all of these are correct

A proportional relationship can be written as an equation in the form ____ = _____  _____

• y = k+x
• y = k-x
• y = kx
• y = k/x

A recipe says to use 3 cups of flour to make 48 cookies. The constant rate of proportionality that relates the number of cookies made, y, to the number of cups of flour used, x, is ______.

It costs $15 to send 3 packages through a certain shipping company. What is the constant of proportionality that relates the cost, y, to the number of packages, x?

• 1/5

• 5

• 45

• 18

If Justin can type 408 words in 4 minutes, What is the constant of proportionality that relates the number of words, y, to the number of minutes, x?

The dry-cleaning for 3 pairs of pants is $18. What is the constant of proportionality that relates the cost, y, to the pairs of pants, x?

For every $5 that Micah saves, his parents give him $10. What is the constant of proportionality that relates the amount that his parents gave him, y, to the amount of money he saved, x?

• 2

• 1/2

• 50

• 15

As a school carnival, tickets can be purchased to participate in different activities. The table shows the total cost for different numbers of tickets. What is the constant of proportionality that relates, y the total cost in dollars to x, the number of tickets purchased?

• 4.00

• 0.25

• 1.00

• 0.10

There are 3 cans that store 9 tennis balls. Let the number of cans be x and the number of tennis balls be y. What is the constant of proportionality?

What is the correct way to find the constant of proportionality?