one satellite radio service charges $10.00 per month plus an activation fee of $20.00. a second service charges $11.00 per month and an activation fee of $15.00 for what number of months is the cost of either service the same?

Answer 1

10x + 20 = 11x + 15.
10x - 11x = 15 - 20
-x = -5
X = 5 mo.