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Pulling an Equation out of a Word Problem

The cost of water use (in dollars) is a linear function of the amount of water used (in hundreds of cubic feet, HCF), as shown in the figure below. The cost for using 19 HCF of water is 33.75 , and the cost for using 36 HCF is 61.80 . What is the cost for using 34 HCF of water?

Solution Preview

We have to first name the variables.

X will be the amount of water used
Y will be the cost

We set up our coordinates:

(19, 33.75)
(36, 61.80)

We ...

Solution Summary

The solution turns the word problem into an equation and solves it in logical, clearly-explained steps.