Answer:
Step-by-step explanation:
In the equation given, y = 51.20x + 32.96, x is the number of hours worked. The number of hours worked is multiplied by the rate the plumber charges per hour. So the choice in the left hand column is "the amount the charges increase for each additional hour off work". In other words, if he works only 1 hour, x = 1, then the charge for his labor is 51.20(1) = 51.20. If he works 2 hours, the charge for his labor is 51.20(2) = 102.40.
The 32.96 is fixed as the average cost of the parts. The choice in the right-hand column is "average cost of parts for each visit".
