SOLUTION: A repair company charges a fixed call out fee for any service call, plus a fixed rate per hour for the length of the repair. A three hour repair costs $155, and a four and half hou

Algebra ->  Linear-equations -> SOLUTION: A repair company charges a fixed call out fee for any service call, plus a fixed rate per hour for the length of the repair. A three hour repair costs $155, and a four and half hou      Log On


   

Question 888251: A repair company charges a fixed call out fee for any service call, plus a fixed rate per hour for the length of the repair. A three hour repair costs $155, and a four and half hour repair costs $215. The fixed-call out fee and the cost of seven hour repair is are
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
y=mx+b
215=4.5x+b
155=3x+b
60=1.5x
40=x
155=120+b
b=35 call out fee
7*40+35=
280+35=315 for 7 hours