Real Life Linear Equations

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

• C = 0.20x + 15

• C =15 (0.20x)

• C = 15 + x + 0.20

• C = 0.20 + 15x

Hurtz Car Rental charges $8.50 an hour plus a rental fee of $25.50. What's the equation?

• y = 8.5 + 25.5

• y = 8.5x + 25.5

• y = 8.5 + 25.5x

• y = 8.5x + 25.5x

A pizza delivery service charges a $5 delivery fee and a $7 charge per pizza (x=pizzas) . f(x) = 7x+5

What does 7 represent in the equation?

• The total cost

• Cost per pizza

• Delivery fee

The mechanic charged Mr. Kalina $140 for the parts and an additional $48 an hour for labor. How many hours of labor did the mechanic work on the car if his total bill was $260?

Solve 48x + 140 = 260

• 3 hours

• 12 hours

• 2.5 hours

• 5 hours

Worlds of fun costs $15.00 to get in and $2.50 per ride, while Adventure land costs $10.00 to get in and $3.00 per ride. Which equations could be used to determine how many rides you would need to go on for both parks to be of equal value?

• 15x + 2.5 = 10x + 3

• 15 - 2.5x = 10 - 3x

• 15 + 2.5x = 10 + 3x

• 15 - 10 = 2.5x + 3x

At Gamestop you can buy a Xbox One for $150.00 and each game to go with it would cost $24.00. Or, you can buy a Playstation 4 for $180.00 and each game for $20.00. Write an equation to determine how many games would need to be purchased for the cost to be equal?

• 150x + 24 = 180 + 20x

• 150 + 24x = 180 + 20x

• 180 - 150 = 24 x + 20x

• 150 - 24x = 180 - 20x

At Joe's Clown Car Rental Agency, renting a car costs $35 plus $0.75 for every mile it is driven. What's the equation look like?

• y = x(35 + 0.75)

• y = 35x + 0.75

• y = 0.75x + 35

• y = 0.75(x + 35)

A Sunflower plant is 5cm tall and growing at a rate of 3cm a month. what does the linear equation look like?

• y = 5 + 3

• y = 5x + 3

• y = 3x + 5

• y = 3x + 5x

Mrs. Math has $150 in her savings account and saves $40 per month. What is the equation ?

• y = 150 + 40

• y = 40x + 150

• y = 150x + 40

An internet company charges a $100 set up fee, and then they charge $35 a month after that. What is the y-intercept (the one time charge)?

• $100

• $35

• $135

• $65