Linear Functions

In the equation, y = mx + b, the letter b is the ___________.

• y-intercept
• x-intercept
• slope
• rate of change

What is the slope of the equation?
y = -3x + 4

• -3
• 3
• 4
• -4

Which is the graph of y= -x + 2?

• A
• B
• C
• D

Bob has $150 in his savings account and saves $40 per month. Which function models his savings?

• y = 150 + 40

• y = 40x + 150

• y = 150x + 40

A golf course charges $15 to rent golf clubs and charges $25 per round to play.  Write an equation to represent the total cost, T, for one player.

• T = 15 + 25r
• T = 15g + 25r
• T = 40 r
• T = 15r + 25

Find f(2)

• 5

• 4

• 3

• 0

What is the y-intercept of the equation:
 y = 2x - 3 

• -2
• 2
• 3
• -3

Find slope:

• m= 4
• m=1/4
• m=-4
• m=-1/4

Which of the following has a y-intercept of 3?

• y = 3x +2
• x=3
• y=2x+3
• y=x

The Roaming Cell Phone Company charges $15.00 per month plus $0.20 per minute of airtime usage.  If Juanita uses x minutes of airtime, what is an equation that can be used to determine her monthly cell phone bill (C)?

• C = 0.20x + 15
• C =15 (0.20x)
• C = 15 + x + 0.20
• C = 0.20 + 15x