Question: Calculating the slope using points A and C , we have rise 5 30 2 24 5 6 and run 5 30 2 15 5

Calculating the slope using points A and C , we have rise 5 30 2 24 5 6 and run 5 30 2 15 5 15, so rise/run 5 6y15 5 2y5 5 0.40. And since the horizontal intercept of the line is 18, its equation is B 5 18 1 0.40T. Under this plan, the fixed monthly fee is $18 and the charge per minute is the slope of the billing line, 0.40, or 40 cents per minute.

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