SOLUTION: 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 functi

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: 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 functi      Log On


   

Question 1099608: 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
1.55
. See the figure below.
If the monthly cost for
18
HCF is
$44.27
, what is the monthly cost for
13
HCF?

Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
(18, 44.27)
(13, x)
44.27-x/5=1.55, the given slope
multiply through by 5
44.27-x=7.75
x=$36.52