A phone company has a monthly cellular data plan where a customer pays a flat monthly fee and then a certain amount of money per megabyte (MB) of data used on the phone. If a customer uses 96 MB, the monthly cost will be $31.40. If the customer uses 39 MB, the monthly cost will be $22.85.
Find a linear equation for the monthly cost of the data plan, C, as a function of x, the number of MB used.
C(x) =
Use your equation to find the total monthly cost if 260 MB are used.