The monthly cost (in dollars) of water use is a linear function of the amount of water used (in hundreds of cubic feet, HCF). The cost for using 13 HCF of water is $34.58, and the cost for using 24 HCF is $53.83. What is the cost for using 19 HCF of water?

The monthly cost (in dollars) of the water use (in dollars) is a linear function of the amount of water used (in hundreds of cubic feet, HCF)

The cost for using 28 HCF of water is 39.49, and the cost for using 47 HCF is 65.14.

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You have 2 points: (28,39.49) and (47,65.14)

slope = (65.14-39.49)/(47-28) = 1.35

y = mx+b

39.49 = 1.35*28 + b

b = 1.69

Step-by-step explanation:

C(x) = 1.35x + 1.69

What is the cost for using 32 HCF of water?

C(32) = 1.35*32 + 1.69

C(32) = $44.89

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