Question

The equation 9+12m=6+15(m-1) models the following situation: Movie-rental company A charges a sign-up fee of $9 plus $12 per month, and company B charges $6 for the first month plus $15 per month after that. At a certain number of months, the cost of the two companies is equal. Which equation is a simplified version of the one above?

Answer 1

9 + 12m = 6 + 15
12m=21-9
12m=12
m=12
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12
m=1
espero ter ajudado bjjs

Answer 2

3m = 18

after 6 months the prices are the same