Constant or Proportionality

Write the equation for the table.

Based on this table, constant of proportionality is (a)   . The equation is (b)   .

• k=1/4

• k=2

• k=4

• k=6

• y=1/3x

• y=2x

• y=1/4x

Noah is calculating the cost of gasoline for his car. He finds that the cost (y) is directly proportional to the amount of gasoline (x) he buys. If the equation representing this scenario is y=3.8x, identify the constant of proportionality.

Maya is selling lemonade at a stand. If she sells each cup for 5 times the cost of making it, what is the constant of proportionality in the equation y=5x, where y is the selling price and x is the cost of making one cup of lemonade?

• k=5

• y=5x

• k=1/5

• y=1/5x

Identify the constant of proportionality

• k = 1/90

• k = 1/30

• k = 90

• k = 30

Identify the constant of proportionality.

• k = 2x

• k = 2

• k = 4

• none

What is the constant of proportionality?

• 7

• 14

• 10

• 21

Name the constant of proportionality.

• 20

• 40

• 16

• 35

Identify the unit rate (scale factor) in this equation.

• 2x

• 2

• 4

• none

What is the constant of proportionality?

• k=3

• y=3x

• k=1/3

• y=1/3x