A plumbing company charges its customers \$112 for the first hour of …

Question

Prompt

A plumbing company charges its customers $112 for the first hour of a plumbing service call and $40 for each additional hour, plus the cost of plumbing parts. Which equation represents the total cost y in dollars, for an x-hour plumbing service call where the cost of parts was $z and

x \geq 1

y = 40 x + z

y = 40 x + z + 72

y = 112 x + z

y = 112 x + 40 z + 72