SOLUTION: 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 16 HCF of water is $34.60, and the

Question 1152386: 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 16 HCF of water is $34.60, and the cost for using 30 HCF is $57.70. What is the cost for using 28 HCF of water?

Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
given:
The monthly cost (in dollars) of water use is a linear function:
where represents and represents the for
if the cost for using HCF of water is $, means
that is a point (,)
the cost for using HCF is $, means
that is a point (,)
use points to find slope

=>
to find , use one point above

and, your equation is:
use equation to calculate what is the cost for using HCF of water is:

the cost for using HCF of water is

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