Situations with Slopes

When a tow truck is called, the cost of the service is $10 plus $1 per mile that the car must be towed. Write a linear equation to represent the total cost of the towing service.

• y= 10x +1

• y= x +10

• y= -10x + 1

• y= -x +10

Your new job is at the Custom T- Shop, where T-shirts are printed to order. For each order, Custom T Shop, charges $8.00 per shirt plus a one time set up fee of $15.00. Write a linear equation to show the relationship.

• y= -8x + 15

• y= 15x + 8

• y= -15x + 8

• y= 8x +15

When a plumber is called, the cost of the service call is $50 for him to show up at your house, plus an additional $25 per hour. Write a linear equation.

• y=50x + 25

• y= 25x + 50

• y= -25x - 50

• y= -50x -25

Your cell phone company charges $20 a month plus $0.50 per text message. Write an equation to show the total cost the cell phone company charges.

• y= 20x + .50

• y= -0.50x + 20

• y= 0.50x + 20

• y= -20x - 0.50

Suppose a town has a population of 5,000 residents but that the population is decreasing by 200 people each year. Write a linear equation for this situation.

• y= -200x + 5000

• y= -5000x + 200

• y= 200x + 5000

• y= 5000x+ 200

At a fair, Bob draws caricatures. He pays the fair $30 for the space to set up a table and $2 for each drawing he sells. Write a linear equation to show how much he pays total.

• y= 2x -30

• y= 2x + 30

• y= 30x + 2

• y= -2x + 30

The rental rate at Rent a Wreck is $30 for each day plus $0.25 per mile driven. Write a linear equation to find the total cost for each day.

• y= 30x + .25

• y= -0.25x- 30

• y= 0.25x + 30

• y= -30x- 0.25

Mike is buying a large pizza. The pizza cost $8.00 plus $0.50 for each additional topping. Which function correctly models the situation?

• y= 8x +.50

• y= 8.50x

• y= .50x+ 8

• y= 8x- .50x

Bob the plumber charges $15 per hour plus a service fee of $40 for coming out to your house. Which function models this situation?

• y= 40x+ 15

• y= 15x- 40

• y= 15x

• y= 15x + 40

Valerie is traveling at a rate of 65mph. Which function would be used to model the situation?

• y= 65x

• y= x

• y= x + 65

• y= 65