SOLUTION: Natural Gas. The cost of 1000 cubic feet of natural gas is $39 and the cost of 3000 cubic feet is $99 There is a linear equation that expressed the cost C in terms of the numberof

Question 127224: Natural Gas. The cost of 1000 cubic feet of natural gas is $39 and the cost of 3000 cubic feet is $99 There is a linear equation that expressed the cost C in terms of the numberof cubic feet n. Find the equation and find the cost of 2400 cubic feet of natural gas.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
If cubic feet of gas is plotted on the horizontal axis
and the corresponding cost on the vertical axis,
we are given 2 points, (1000, 39) and (3000,99)
There is a formula you can use

the given points are (x[2],y[2]) and (x[1],y[1])

multiply both sides by

or in this case,
answer
check:
See if this line goes through (1000, 39) and (3000,99)

OK
Find the cost of 2400 cubic feet of natural gas.

dollars answer
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