DorothaCoslan
25

# 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

$A:y=40+30x= \\ y=30x+40 \\ \\ B:y=30(5)+40= \\ y=150+40= \\ y=190 \\ \\ C:(115)=30x+40= \\ 75=30x= \\ \frac{75}{30} =x \\ x= \frac{5}{2} = \\ x=2.5$ y=30x+40 \$190 2 hours 30 minutes