College Algebra

A phone company has a monthly data plan where a customer pays flat monthly fee of $30 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 $42. If the customer uses 8 GB, the monthly cost will be $62.

a. Find a linear equation for the monthly cost of the data plan as a function of x, the number of MB used.

b. Interpret the slope and y-intercept of the equation.

c. Use your equation to find the total monthly cost if 10 GB are used.

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  1. cost=30+rate*volume
    42=30+ rate*3
    62=30+rate*8

    use either equation to solve for rate. Your teacher is too easy.
    a) above
    b) the slope says more data, more cost. y intercept? Zero data cost

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