Question

What is the length of a phone call that would cost the same no matter which company is used?

Company A 35cents plus 3 cents per minute
Company B 45 cents plus 2 cents per minute

Answer 1

First, make an equations for each company

35+3x= Company A
45+2x= Company B

Then, equate the equations
35+3x= 45+2x
-2x -2x
35+ x = 45
-35 -35

x=10, So, 10 minutes will be the length of a phone call that would cost the same no matter which company is used.