Answer:
The equation will be y = 78x + 120
If the plumber will work for 5 hours you will have to pay him $510.
Step-by-step explanation:
The question basically says that the final cost will be equal to 120$ that you have to pay for the call plus $78 each our, so ...
If we let "x" be the number of hours, and y be the total cost, the equation will be as follows...
y = 78x + 120
Now, if the plumber will work for 5 hours then the amount of money that you will have to pay will be equal to...
y = 78x + 120
y = 510
Therefore you will have to pay $510 to the plumber if he was to work for 5 hours.
