SOLUTION: A plumber charges $160 for a 1 hour and $280 for a 3 hour job. Which function models the cost of a job for x hours?

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Question 1007787: A plumber charges $160 for a 1 hour and $280 for a 3 hour job. Which function models the cost of a job for x hours?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Well, since he charges $120 more for a job two hours longer, he charges $60 an hour for his labor.
The 1 hour job was $160 because he charges $100 just to come out.
The the cost, C, of a job of x hours would be
C = 60x + 100