The cable company has two plans:

Question

Plan 1- Flat fee of $45 a month
Plan 2- $15 a month plus 45 cents per minute

What two equations would you use to graph the two plans?

After how many minutes does it not make a difference which plan you use?

Answer 1

Let Y be the monthly cost in dollars, and t the totl minutes of all calls in one month
Plan 1: Y1 = 45
Plan 2: Y2 = 15 + 0.45 t
That's two equations.
Set Y1 = Y2 to solve for the t that makes the charges equal.

Answer 2

2x+6x