m > 650 miles
A mileage over 650 miles makes company A cheaper than B.
1) Gathering the data
Company A
$127 (unlimited mileage)
Company B
$75 + 0.08m
2) To find out the mileage that makes Company A cheaper than Company B, we can write out the following:
[tex]\begin{gathered} ANote that we've subtracted 75 from both sides and divided both sides by 0.08.
3) Hence when we drive over 650 miles the Company A becomes cheaper than B.