A phone company has a monthly data plan where a customer pays flat monthly fee of $ 15 and then a certain amount of money per gigabyte (GB) of data used on the phone. If a customer uses 3 GB, the monthly cost will be $ 24. If the customer uses 7 GB, the monthly cost will be $ 36.
Find a linear equation for the monthly cost of the data plan as a function of x, the number of MB used.
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Home » Mathematics » A phone company has a monthly data plan where a customer pays flat monthly fee of $ 15 and then a certain amount of money per gigabyte (GB) of data used on the phone. If a customer uses 3 GB, the monthly cost will be $ 24.