Identifying Proportional and Nonproportional Graphs

Is the graph proportional or non proportional?

• proportional

• non proportional

Which of these could be a constant of proportionality.

• 20

• 40

• 2

• 80

Write an equation for this relationship.
y = total cost
x = days

• x=18.50y

• y=18.50x

• y=22.50x

• y=22x

In the equation y = 14x, what is the constant of proportionality?

• y

• x

• 14

• =

Which graph is proportional?

• A

• B

• C and D

• All of the graphs are proportional

Is the graph proportional?

• Yes

• No

These two lines are graphs of nonproportional relationships. What makes them nonproportional?

• They are not straight

• They are not linear

• They do not go through the origin

• They do not show a constant rate of change

Does the equation show a proportional relationship?

• Yes

• No

Why does this graph show a non-proportional relationship?

• Because it is proportional

• It goes through the origin

• It does not go through the origin

• It is a straight line

Which of the equations below is proportional?

• y = 6x

• y = 3x + 2

• y = 2x + 4

• y = -2x -1