Ex: Find a Linear Equation Application - Cell Phone Plan

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This video provides an example of how to find a linear equation for a cell phone plan with a monthly flat fee and a per minute fee.
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How do cell phone companies decide what fee per minute they should charge? Do they first set a monthly total and then reverse engineer to solve for the fixed charge per month and fee per minute? Or do they arbitrarily decide on the fixed charge per month and the fee per minute first, and then solve for everything else afterwards?

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