Question 146069: 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 1.45.
If the monthly bill for 19 HCF is $ 21.07 , what is the monthly bill for 25 HCF?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 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 1.45.
If the monthly bill for 19 HCF is $ 21.07 , what is the monthly bill for 25 HCF?
----------------
slope = 1.45 and the graph passes thru (19,21.07)
---------
Form:
cost = 1.45(HCF) + b
21.07 = 1.45(19) + b
b = -6.48
----------------
EQUATION:
cost = 1.45(HCF)-6.48
C(25) = 1.45*25 -6.48
C(25) = $29.77
==================
Cheers,
Stan H.
|
|
|
