Problema 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 function gives a line with a slope of 1.75.
If the monthly cost for 12 HCF is $27.44, what is the monthly cost for 8 HCF?
Answer provided by our tutors
Slope is given as 1.75.
And monthly cost for 12 HCF is $27.44.
Let b is the y-intercept.
m=slope of the line.
So, y=mx+b
27.44=1.75*12+b
27.44=21+b
b=27.44-21
b=6.44
Cost of 8 HCF= 1.75*8+6.44=14+6.44=20.44
Cost of 8 HCF=$20.44