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 $31.47 ,

Algebra ->  Coordinate Systems and Linear Equations -> 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 $31.47 ,       Log On


   

Question 1052968: 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
$31.47
, and the cost for using
35
HCF is
$64.72
. What is the cost for using
25
HCF of water?
WaterusageinHCF
Monthlycostindollars
Answer by josgarithmetic(39615) About Me  (Show Source):
You can put this solution on YOUR website!
Two ordered pair, (16, 31.47) and (35, 64.72), would be part of a linear equation. You placed your question in "Algebra: Systems of Linear Equations".

Use formula for slope, and the point-slope form equation of a line (not the only way).

Picking the first point with x=16,
y-31.47=%28%2864.72-31.47%29%2F%2835-16%29%29%28x-16%29


Simplify that and form into y as a function of x.