Question

A plumber changes 40 dollars to come to the house and 30 dollars for each hour spent working on your plumbing . If X represents the number of hours of work and y represent total charge the plumber makes,write the equivalent in part A. C if the plumber work 5 hours how much was the total charge? If the charge was 115 dollar how hours did the plumber spent working

Answer 1

y=30x+40

$190

2 hours 30 minutes

Explanation:

Answer 2

`A:y=40+30x= \\ y=30x+40 \\ \\ B:y=30(5)+40= \\ y=150+40= \\ y=190 \\ \\ C:(115)=30x+40= \\ 75=30x= \\ (75)/(30) =x \\ x= (5)/(2) = \\ x=2.5`

y=30x+40
$190
2 hours 30 minutes