3/8 Rate of Change GRADE

Sonya has $40 in her lunch account and pays $2 each day to eat lunch. Which equation can be used to find the amount of money Sonya has left on her account after x days?

• y = 40 + 2x

• y = - 2x + 40

• y = 2 + 40x

• y = 2 - 40x

Which of the following situations could be described by the equation y= -25x + 120

• There are 120 people in the football stadium, and 25 more are entering each hour.

• A plumber charges $25 for a house call and $120 per hour.

• A teacher has 120 students. Her third period has 25 students

• There are 120 gallons of water in a tank. It releases water at a rate of 25 gallons per minute

Speedy Boat Rental charges a $15 deposit fee plus $2 for each hour of use to rent a paddle boat.  Write an equation for C, the total cost, to rent the boat for h hours.

• h = 2C + 15
• C = 15h + 2
• h = 15C + 2
• C = 2h + 15

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

• y = 12.50 + 30x

• y = 12.50x + 30

• y = 12.50 + 30

• 12.50x = 30

The local service center advertises that it charges a flat fee of $50 plus $8.25 per mile to tow a vehicle. Write an equation that represents the total cost (C) of a service for m miles of towing.

• M = 8.25c + 50

• C = 50m +8.25

• y = 50x + 8.25

• C = 8.25m + 50

Find the equation of the line in the graph.

• y = 2x + 5

• y = -2x + 5

• y = 5 + 2x

• y = - x + 5

You and your friends plan to attend the county fair this weekend.  Admission to the fair is $5 and the cost per ride is $0.50.  How many rides can you go on if you have $13? (SOLVE IT)

• 8 rides

• 16 rides

• 4 rides

• 26 rides

What do you have to calculate for this key word.

Fee

• slope

• Y-intercept

What do you have to calculate for this key word.

Per

• slope

• Y-intercept

What do you have to calculate for this key word.

Initial

• slope

• Y-intercept