Question

A cellphone service provider charges $5.00 per month and $0.20 per minute per call. If a customer's current bill is $55, how many minutes did the customer use? (Round any intermediate calculations and your final answer to the nearest whole minute.)

Answer 1

We can create the following linear equation.

y=0.2x+5

"x" will represent the call time and "y" will represent the monthly bill.

So when y (monthly bill) is 55...

55=0.2x+5

0.2x=50

x=250 minutes

answer: 250 minutes