Modeling with Linear Functions · Exercise 52
A phone company has a monthly cellular data plan where a customer pays a flat monthly fee of $10 and then a certain amount of money per megabyte (MB) of data used on the phone. If a customer uses 20 MB, the monthly cost will be $11.20. If the customer uses 130 MB, the monthly cost will be $17.80.
ⓐFind a linear equation for the monthly cost of the data plan as a function of the number of MB used.
ⓑInterpret the slope and y-intercept of the equation.
ⓒUse your equation to find the total monthly cost if 250 MB are used.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Algebra and Trigonometry 2e · §4.2 Modeling with Linear Functions · Exercise 52
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