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The cost of water use (in dollars) is a linear function of the amount of water used(in hundreds of cubic feet, HCF),the cost for using 20 HCF of water is $33.32 and the cost for using 31 HCF is $51.47 . What is the cost for using 22 HCF of water?

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Solution Summary

The solution shows how to calculate the cost of water, which is a linear function of the amount of water used.

Solution Preview

Let c be the cost of using R (HCF) water, the linear function can be written as:
c = mR + b

now we know that
(1) R = 20, C = 33.32, substituting to the equation ...

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