(a) Write a linear equation that relates the monthly charge C, in dollars, to the number x of kilowatt-hours used in a month, 0 s x s 800. (b) Graph this equation. (c) What is the monthly charge for using 200 kilowatt- hours? (d) What is the monthly charge for using 500 kilowatt- hours? (e) Interpret the slope of the line. Source: Commonwealth Edison Company, January 2014.

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A: topic- linear equations

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A: (1) what is the formula used to find slope?

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