SOLUTION: The monthly cost of water use is a linear function of the amount of water used is in HCF. The cost for using 19 HCF of water is $32.11, and the cost for using 55 HCF is $80.71. Wha
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Question 1124378: The monthly cost of water use is a linear function of the amount of water used is in HCF. The cost for using 19 HCF of water is $32.11, and the cost for using 55 HCF is $80.71. What is the cost for using 30 HCF of water?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Plot HCF on the horizontal axis
Plot cost on the vertical axis
Let = HCF
Let = cost
———————————————
Use point-slope formula to find equation
——————————————
Let
The cost is $46.96
———————————
Check the equation:
OK
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