Ameren Illinois supplies natural gas to residential customers for a monthly customer charge of $18.76 plus 31.935

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Ameren Illinois supplies natural gas to residential customers for a monthly customer charge of $18.76 plus 31.935 cents per therm of heat energy.

(a) Write a linear equation that relates the monthly charge C, in dollars, to the number x of therms used in a month.

(b) What is the monthly charge for using 90 therms?

(c) What is the monthly charge for using 150 therms?

(d) Graph the equation.

(e) Interpret the slope of the line.

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