For what mileages will Company a charge less than company b?

Question

company a charges $131 and allows unlimited mileage. Company b has an initial fee of $75 and charges an additional $.70 for every mile driven.

Answer 1

Let x be the number of miles.

0.7x + 75 > 131

Subtract 75 from both sides.

0.7x > 56

Divide both sides by 0.7

x > 80

If mileage is over 80 miles, company a will be cheaper.