Constant of Proportionality

Which graph is proportional?

• A

• B

• C and D

• All of the graphs are 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 an equation for this relationship.

• y=18x

• y=18.50x

• y=22.50x

• y=22x

Write the equation for the table given.

• y = 16x

• y=8x

• y=12x

Is this table proportional or non-proportional?

• Yes

• No

Write an equation for this relationship.

• y = 18x

• y = 18.50x

• y = 22.50x

• y = 22x

Determine the direction variation.

• y=1x

• y=4x

• y=8x

• y-2x

Which graph shows a proportional relationship?

• A

• B

• C

• D

What is k in this proportional relationship?

• 60 

• 120

• 1

• 180

Which statement matches the graph?

• Taylor can write 6 words per minute

• Taylor can write 25 words per minute

• Taylor can write 50 words per minute

• Taylor can write 150 words per minute