The phone company A Fee and Fee has a monthly cellular plan where a customer pays a flat monthly fee and then a certain amount of money per minute used on the phone. If a customer uses
310 minutes, the monthly cost will be $68. If the customer uses 620 minutes, the monthly cost will
be $99.

A) Find an equation in the form y = mx + b, where x is the number of monthly minutes used and
y is the total monthly cost of the A Fee and Fee plan.
y =
B) Use your equation to find the total monthly cost if 980 minutes are used.
If 980 minutes are used, the total cost will be
dollars.