It costs 22.00 per hour plus a flat fee of 33.00 for a plumber to make a house call. After writing an equation for his situation, suppose the total to have a plumber come to a house is 231. How many hours did the plumber work?

Question

campbell_st · Answer

well let C = cost and H = hours.. 

the plumber gets $33 for just turning up and 22 per hour 

so C = 22h + 33

anonymous · Answer

How many hours did he work? I got 7 cause I divided 231/33

anonymous · Answer

The answers given are 6hr, 19hr, 16 hr or 9 hr.

campbell_st · Answer

well you have an equation to solve 

$$132 = 22h + 33$$

1st step is to subtract 33 from both sides of the equation... 

$$99 = 22h$$

now divide both sides of the equation by 22 

the answer is the number of hours

anonymous · Answer

How did you get 132? Do you suppose to use 231?

campbell_st · Answer

oops typo

so 

231 = 22h + 33

subtract 33 from both sides

198 = 22h

divide both sides of the equation by 22

this is the number of hours...

anonymous · Answer

I got  9 hours

campbell_st · Answer

well that makes sense..

anonymous · Answer

c=22h+33
231=22h+33
231-33=22h
198=22h
h=198/22=9hours