Question

Alex owes his father $100. His father pays him $12.50 an hour to work at their family store. The function d=100-12.5h represents the amount of debt d Alex has. How many hours will it take him to pay off his debt?

Answer 1

8 Hours.

If you want his debt to be 0, as in he has nothing left to owe, we will set d (his debt) to 0

0 = 100 - 12.5h

Subtract 100 to move it to the other side

-100 = -12.5h

Divide each side by -12.5

8 = h