Non-Proportional Relationship

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

Steve started with #250 and spent $25 per week. Chelsea started with $30 and saved $30 per week. Which equations represent these situations?

• y = 250 - $25x

• y = 30 + 30x

• y = 250x + 25

• y = 30x - 30

What type of slope?

• undefined

• positive slope

• negative slope

• zero slope

What is the y-intercept of this graph?

• (0,1)

• (0,-2)

• (0,0)

• (0,3)

Determine if the ratios are proportional.
4/5 and 15/20

• Yes

• No

What is the y-intercept?

• 1/2

• 2

• 7

• 3

Does the equation show a proportional relationship?

• Yes

• No

Steve started with $250 and spent $25 per week. Chelsea started with $30 and saved $30 per week.

Which two equations represent these situations?

• y = 250 - 25x

• y = 30 + 30x

• y = 250x + 25

• y = 30x - 30

Write the equation of the line.

• y = -2/3x + 4

• y = 2/3x + 4

• y = 3/2x + 4

• y = -3/2x + 4

What does 'b" represent in y=mx+b

• y-intercept

• change in y

• change in x

• constant rate of change