Equations and Costs Quiz

Each hat you buy from the Custom Cap Company costs $7 plus a one-time fee of $23. Which equation can be used to find y, the total cost to buy x hats?

• y=30x

• y=x+30

• y=23x+7

• y=7x+23

Nick is saving up for a new laptop. His dad gave him $50 to start saving, and he earns $9 every hour from his job, which he also saves. Write an equation that can be used to find y, the total amount of money Nick has saved after working x hours.

• y=9x+50

• y=50x+9

• y=9x-50

• y=50x-9

A plumber charges $50 per hour, plus an additional $70 just for showing up at your house. Write an equation to find y, the total cost of hiring this plumber, if x represents the number of hours she works.

• y=50x+70

• y=70x+50

• y=50x-70

• y=70x-50

A pool already contains 55 gallons of water when Bob begins to fill it. He fills the pool at a rate of 8 gallons per minute. Write an equation that shows y, the total number of gallons in the pool x minutes after Bob began to fill it.

• y=8x+55

• y=55x+8

• y=8x-55

• y=55x-8

What is the equation of the line in graph 1 in the form y = mx + b?

• y = x + 1

• y = 2x + 1

• y = -x + 1

What is the equation of the line in graph 2 in the form y = mx + b?

• y = -x + 5

• y = x - 5

• y = -2x + 4

• y = 2x - 5

What is the equation of the line in graph 3 in the form y = mx + b?

• y = 2x - 1

• y = x - 1

• y = 0.5x - 1

What is the equation of the line in graph 4 in the form y = mx + b?

• y = -4x + 4

• y = x - 4

• y = -2x + 4

• y = 2x - 4

What is the equation of the line in graph 6 in the form y = mx + b?

• y = -x + 5

• y = x - 5

• y = -2x + 5

• y = 2x - 5

What is the equation in the form y = mx + b for the table in box 1?

• y = x + 3

• y = x + 2

• y = x + 1