Constant of Proportionality Chart

The constant of proportionality in the equation y = ½x is _______. 

• x

• y

• 1/2

• 2

Which graph is proportional?

• A

• B

• C and D

• All of the graphs are proportional

Identify the constant of proportionality.

• k = 2x

• k = 2

• k = 4

• none (not proportional)

Identify the constant of proportionality.

• k = 6

• k = 12

• k = 1/6

• k = 1/12

• none (not proportional)

Identify the constant of proportionality.

• k = 5

• k = 1/5

• k = 1

• k = 2.5

• none (not proportional)

Identify the constant of proportionality.

• k = 25

• k = 50

• k = 100

• k = 1/50

• none (not proportional)

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

• y = k+x

• y = k-x

• y = kx

• y = k/x

Write the equation for the table given.

• y = 16x

• y=8x

• y=12x

Write an equation for this relationship.

• y = 18x

• y = 18.50x

• y = 22.50x

• y = 22x

What is the direct variation?

• y=9/3x

• y=6x

• y=9x

• y=3x