Question

Option 1: Purchase a new phone for $300. Your cell phone bill will be $80 per month. Option 2: Make monthly payments of $25 for your phone. Your cell phone bill will be $70 per month (plus the $25 for the phone). How many months same overall cost?

Answer 1

`20` months

Explanation:

Translate each of the options into mathematical equations.
If `y` is the overall cost of the option, and `x` is the number of months, then:
Option 1: `y=300+80x`
Option 2: `y=25x+70x`

Set the equations equal to each other:
`300+80x=25x+70x`
`300=15x`
`x=20`