Equations Proportional or Not Proportional

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

Identify whether the graph represents a  proportional or non-proportional relationship.

• Proportional Relationship

• Non-Proportional Relationship

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 or non proportional?

• proportional

• non proportional

Which graph is non-proportional?

• A

• B

• C

• D

Write an equation for this situation.

• y=9.75x

• y=19x

• y=19.25x

• y=9.5x

Which statement best describes the relationship between x and y in the table?

• Proportional

• Not Proportional

What does the y-intercept represent?

• It costs $30 for each mile drive.

• There is an initial charge of $30 for the moving van.

• There is an initial charge of $2 for the moving van.

• It costs $1 for every 2 miles driven.

What is the equation of the graph?

• y = x + 2

• y = 1/2x

• y = 2x

• y = x + 1

What is the rate of change for the following graph?

• 80

• 20

• 40

• 160