document.write( "Question 103969: A concrete driveway has a perimeter of 280 feet. The length of the driveway is 20 feet more than 4 times its width. Find the length and width of the driveway by writing two equations with two variables, and solving the equations by either the addition method or the substitution method. \r
\n" ); document.write( "\n" ); document.write( "To get credit, you must define the variables, create two equations, then solve those two equations using algebraic methods of addition or substitution.
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Algebra.Com's Answer #75662 by elima(1433)\"\" \"About 
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A concrete driveway has a perimeter of 280 feet. The length of the driveway is 20 feet more than 4 times its width. Find the length and width of the driveway by writing two equations with two variables, and solving the equations by either the addition method or the substitution method.
\n" ); document.write( "L=length
\n" ); document.write( "W=width
\n" ); document.write( "2W+2L=280
\n" ); document.write( "L=4W+20
\n" ); document.write( "I will use the substitution method;
\n" ); document.write( "2W+2(4W+20)=280
\n" ); document.write( "2W+8W+40=280
\n" ); document.write( "10W=240
\n" ); document.write( "W=24
\n" ); document.write( "Now plug that into either equation for W;
\n" ); document.write( "2(24)+2L=280
\n" ); document.write( "48+2L=280
\n" ); document.write( "2L=232
\n" ); document.write( "L=116
\n" ); document.write( ":) \n" ); document.write( "
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