Proportional Linear Relationships

Alex works as a lawnmower and his company pays him $5 a day plus an additional $5 every hour he works. Which graph represents the amount of earnings that Alex can make in one day?

• A

• B

• C

• D

Stella got a new internet plan.  The company charges her $0.15 for each minute plus a monthly fee of $40.  What equation would be used to calculate how much the cost is for her new internet plan?

• y=0.15x-40

• y=0.15x+40

• y=0.15-40x

• y=0.15+40x

The m in the equation y= mx +b      is defined as the: 

• y intercept

• run of the graph

• rise of the graph

• constant rate of change

what is b for this line?

• 40

• 10

• 20

A graph needs to be a straight line and goes through _____ to be proportional.

• The origin

• The y-intercept

• The y-axis

• The x-axis

A graph needs to go through _____ to be proportional.

• The origin

• The y-intercept

• The y-axis

• The x-axis

The number of trees and the number of apples are given in the table above.  Determine which statement below is correct.

• The table is not proportional because the unit rate is not constant.

• The table is proportional and the unit rate is 1/13

• The table is proportional and the unit rate is 13.

• The table is not proportional because it doesn't pass through the origin.

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

• y-intercept

• change in y

• change in x

• constant rate of change

The equation below represents the amount of money y that Melissa earns by working at a clothing store for x hours, plus a holiday bonus.
y = 12x + 10
What is Melissa’s hourly rate?

• 10

• 18

• 12

• 8(2) + 10

A company prints designs on T-shirts. They charge $40 for set up costs plus $12 per shirt. How much would it cost for 10 shirts?

• $160

• $180

• $210

• $120