Question

The equation y = 35.25x + 40 gives the labor cost y of repairing a car if it takes x hours to repair the car. Which statement is true?

For every hour of labor, the cost decreases by $40.

For every hour of labor, the cost decreases by $35.25.

For every hour of labor, the cost increases by $40.

For every hour of labor, the cost increases by $35.25.

Answer 1

For every hour of labor, the cost increases by $35.25.

Explanation:

Got it right on the test.

Answer 2

repari cost (x) = y = 35.25 x + 40

x = number of hours to repair the car.

Every hour the cost will increase 35.25, becasue 40 is a fixed cost.

if x = 1, repair cost(1) = 35.25 + 40

if x = 2, repair cost (2) = 35.25*2 + 40

if you subtract repair cost (1) from repair cost (2) you get 35.25*2 - 35.25 = 35.25

The same thing every time the repair time increases one hour.

Answer: the last option of the list, for every hour of labor, the cost increases by $35.25