SOLUTION: A car rental company has two rental rates. Rate 1 is $81 per day plus $0.18 per mile. Rate 2 is $161 per day plus $0.09 per mile. If you plan to rent for one week, how many mile

Algebra ->  Expressions-with-variables -> SOLUTION: A car rental company has two rental rates. Rate 1 is $81 per day plus $0.18 per mile. Rate 2 is $161 per day plus $0.09 per mile. If you plan to rent for one week, how many mile      Log On


   



Question 352635: A car rental company has two rental rates. Rate 1 is $81 per day plus $0.18 per mile. Rate 2 is $161 per day plus $0.09 per mile.
If you plan to rent for one week, how many miles would you need to drive to pay less by taking rate 2.
This is a sample question for a test. I need to know HOW to solve it. I already know the answer I just don't know how she got it..

Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
161 + .09m < 81 + .18m

subtracting .09m and 81 ___ 80 < .09m

dividing by .09 ___ (80 / .09) < m