Identifying Proportional and Nonproportional Graphs

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

• x=18.50y

• y=18.50x

• y=22.50x

• y=22x

Write the equation for the table given

• y = 1/3x

• y = 3x

• y = 1/2x

• x = 3y

Write an equation for this situation.

• y=9.75x

• y=19x

• y=19.25x

• y=9.5x

Which graph is proportional?

• A

• B

• C and D

• All of the graphs are proportional

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

Is the graph proportional?

• Yes

• No

Is the graph proportional?

• Yes

• No

Does the equation show a proportional relationship?

• Yes

• No

Which of the equations below is proportional?

• y = 6x

• y = 3x + 2

• y = 2x + 4

• y = -2x -1

Select all graphs that represent proportional relationships.

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