document.write( "Question 103770: I need a real-life application of a linear function. State the application, give the equation of the linear function, and state what the x and y in the application represent. I have to choose at least two values of x to input into my function and find the corresponding y for each. State, in words, what each x and y means in terms of your real-life application. \n" ); document.write( "
Algebra.Com's Answer #75694 by elima(1433)\"\" \"About 
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You can rent an electricity generator for $4.80 per hour plus $100.00 for a full tank of petrol.
\n" ); document.write( "Let y represent the cost of using the generator.
\n" ); document.write( "Let x represent the hours.
\n" ); document.write( "The cost is $4.80 per hour plus $100.00 for a the petrol tank.
\n" ); document.write( "Translate the statement to an equation.
\n" ); document.write( "y = 100.00 + 4.80x
\n" ); document.write( "Then a function;
\n" ); document.write( "f(x) = 100.00 + 4.80x
\n" ); document.write( "Lets choose 6 for the hours,
\n" ); document.write( "substitute 6 for x.
\n" ); document.write( "f(6) = 100.00 + 4.80 (6)
\n" ); document.write( "f(6) = 100.00 + 28.80 = 128.80
\n" ); document.write( "So, the cost of renting the generator for 6 hours is $128.80
\n" ); document.write( "Now choose another value for x and solve equation just as I did for y.
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