Linear Functions Writing

Sandra has a $20 itunes gift card and spends $3 each month.  Which equation can be used to find how much money Sandra has on her giftcard after x months?

• y = 3x + 20

• y = 3 + 20x

• y = -3x + 20

• y = -20x + 3

The total cost (y) at an amusement park can be modeled by y=1.5x+20 where x is the number of rides you ride. What is the entrance fee?

• 1.5

• 200

• 0

• 20

A man is climbing down from 100 feet high descending 30 feet per minute.

• y = - 30x + 100

• y = 100 + 30x

• y = 100x + 30

• y = 100x - 30

A holiday meal costs $12.50 a person plus a delivery fee of $30.  Which equation represents the amount a holiday meal costs, including delivery, for x people?

• y = 30 + 12.5x 

• y = 12.5 + 30

• y = 12.5 + 30x

Which equation represents the line shown on the coordinate plane?

To rent a bike, Max pays a flat fee plus an hourly rental fee. The graph below shows the amount, C dollars, he pays based on the number of hours, t, he uses the bike. Which statement below is correct based on the information given in the graph?

• Max pays a flat fee of $5 to rent a bike.

• Max pays $5 per hour to rent a bike.

• Max pays $2 per hour to rent a bike.

• Max pays a flat fee of $2 to rent a bike.

Which of the following is a linear equation?

What is the equation of the line that passes through point (0, 7) and has a slope of -2?

Which phrase best describes the graph y = -4x + 6 ?

• It is a straight line with a positive slope.

• It is a straight line with a negative slope.

• It is a non-linear function.

• None of the above.

What is the slope in the equation?

• 2

• -2

• 4

• -4