Question

The total cost of repairing a car is the sum of the amount paid for parts and the amount paid for labor. You paid $78 for parts and $45 for each hour of labor. The total cost to repair the car was $168. How many hours did it take to repair the car?

Answer 1

Answer:2 hours

Step-by-step explanation:

Answer 2

Answer: 2 hours

Explanation

The equation for this problem is 78 + 45x = 168

1) First subtract 78 from both sides

78 +45x = 168

-78             -78

___________

45x = 90

2) Now divide 45 from 45x to leave the x by itself and do the same for the other side

$\frac{45x}{45} = \frac{90}{45}$

x = 2

It took 2 hours to repair the car