Math work needing help

Question

Kira will rent a car for the weekend. she can choose one of two plans. The first plan has an initial fee of $49 and costs an additional $0.12 per mile driven. The second plan has an initial fee of $38 and costs an additional $0.17 per mile driven.

Answer 1

Plan A: C=49+.12M

Plan B C=38+.17M

set them equal 49+.12M = 38+.17M

.05M = 11

M= 11/.05 = 220 miles

If you drive more than 220 miles Plan A is less expensive

Drive less than 220, Plan B is better

Drive exactly 220 miles, the plans are the same cost