Suppose that a household's monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, HCF). When graphed, the function gives a line with a slope of 1.35 . See the figure below.

Question

Suppose that a household's monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, HCF). When graphed, the function gives a line with a slope of 1.35 . See the figure below.If the monthly cost for13 HCF is 25.43$ , what is the monthly cost for 19 HCF?

Accepted Answer

Given:y = mx + bm = slopeb = y-intercept.m = 1.35x = 1325.43 = 1.35(13) + b25.43 = 17.55 + bb = 25.43 - 17.55b = 7.88y = 1.35(19) + 7.88y = 25.65 + 7.88y = 33.53The monthly cost for 19HCF is $33.53

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Suppose that a household's monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, HCF). When graphed, the function gives a line with a slope of 1.35 . See the figure below.