document.write( "Question 205174: The cost of water(in dollars) is a linear fuction of the amount of water used(in hundreds of cubic feet,HCF). The cost of using 18 HCF is $39.35 and the cost of using 55 HCF is $104.10. What is the cost of using 53 HCF of water \n" ); document.write( "
Algebra.Com's Answer #154876 by stanbon(75887)\"\" \"About 
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The cost of water(in dollars) is a linear fuction of the amount of water used(in hundreds of cubic feet,HCF). The cost of using 18 HCF is $39.35 and the cost of using 55 HCF is $104.10. What is the cost of using 53 HCF of water
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\n" ); document.write( "You have two points relating usage and cost.
\n" ); document.write( "You want cost to be the dependent variable.
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\n" ); document.write( "Points: (18 , 39.35) and (55 , 104.10)
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\n" ); document.write( "slope = (104.10-39.35)/(55-18) = 64.15/37 = 1.7338
\n" ); document.write( "intercept: 39.35 = 1.7338*18 + b
\n" ); document.write( "b = 8.14189
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\n" ); document.write( "Equation: cost = 1..7338(use)+8.14189
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\n" ); document.write( "cost(53) = 1.7338*53+8.14189 = $100.03
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
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