Proportional Relationships & Constant of Proportionality

Which equation represents this graph?

• y=80x

• y=20x

• y=40x

• y=160x

Proportional or Non-Proportional?

• Proportional

• Non-Proportional

Which graph is non-proportional?

• A

• B

• C

• D

Determine the missing value in the table.

• 15

• 3

• 1/3

• 9

Identify the constant of proportionality.

• 25

• 50

• 1/50

• none (not proportional)

Proportional or Non-Proportional?

• Proportional

• Non-Proportional

What equation is ALWAYS used to determine proportional relationships?

• x=ky

• y=kx

• y=k

• y=x

What does "k" represent?

• Origin

• Constant of Proportionality

• Proportional Relationship

• The units

Does the following table represent a proportional relationship? If so identify the constant of proportional and create an equation to represent it.

• Proportional; k = 1/40 pages per day; y=1/40x

• Proportional; k = 40 pages per day; y=40x

• Not Proportional

• Proportional; k = 40 days per pages; y=40x

Create an equation to represent the proportional relationship in the table given.

• y = 1/3x

• y = 3x

• y = 1/2x

• x = 3y