Solve the problem.
-The cost for labor associated with fixing a washing machine is computed as follows: There is a fixed charge of $25 for the repairman to come to the house, to which a charge of $20 per hour is added. Find an equation that
Can be used to determine the labor cost, C, of a repair that takes x hours. Write the final answer in the form C =
Mx + b.
A) C = 45x
B) C = -20x + 25
C) C = 20x + 25
D) C = 25x + 20

Question

Quizplus · Accepted Answer

The fixed charge of $25 is added to $20 per hour. So, the equation that represents the total cost for x hours of work is:
C = 20x + 25
This is in the form C = Mx + b, where M = 20 and b = 25. Therefore, the best choice is C. For any repair that takes x hours, the fixed charge of $25 must be paid in addition to the labor charge of $20 per hour. Thus, the equation for the labor cost is:
C = 20x + 25
This equation is in the form C = Mx + b, where M is the slope (20) and b is the y-intercept ($25). Therefore, the correct answer is choice C.

Solve the Problem. -The Cost for Labor Associated with Fixing a Washing Machine