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geometry

a phone company charges a flat monthly fee of $15 for cell phone services, plus an additional fee for every minute you talk. in a given month, you are charged $36 for the 24 minutes you talked( not including the $15 flat fee.) let the total cost be c(in $) and the time you talk be t(in minutes)
how do i find the dependent and independent variables, and the "fixed" cost of the phone plan, and what cost do you pay per minute. and how do i write an equation relating c and t

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  1. how is this geometry?

    The independent variable is the one that can change by itself. In this case, the number of minutes you talk: t.

    c = fixed bill + minute rate*t

    The charge for each minute = $36/24 = 1.50 (pretty pricey!)

    c = 15.00 + 1.50t

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  2. how would you write an equation for a phone that cost $30 plus 30 cents per minute

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