Answer :
Simple..
writing in y=mx+b form...
it's charging you $100 already... +10 for each hour used....
y=10h+100
or
y=100+10h
Thus, your answer.
writing in y=mx+b form...
it's charging you $100 already... +10 for each hour used....
y=10h+100
or
y=100+10h
Thus, your answer.