A plumber charges $50 for every house call and an additional $70 for each hour of work. For one house call yesterday, the plumber earned $435.
Which equation can be solved to find the number of hours the plumber worked on the house call?
Let x be the number of hours the plumber worked on the house call.
The total amount earned by the plumber is the sum of the house call fee and the hourly fee multiplied by the number of hours worked:
50 + 70x = 435.