Geoff C. answered • 04/20/19

Purdue Electrical Engineering grad with a desire to help others!

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.