sally's cell phone company charges a flat rate of $15.00 per month and $0.12 per minute. eduardo's cell phone company charges a flat rate of $18.00 per month and $0.09 per minute. how many minutes would you have to use for the price to be the same for both plans?

Answer 1

15+ .12x = 18 + .09x
.03x = 13

Can you solve it from here?

Divide both sides by .03