document.write( "Question 207151: Write a system of two equations in two unknowns. Solve the system by using the substitution method. « The length of a rectangular field is 12 feet longer than the width. If the perimeter is 144 feet, then what are the length and width \n" ); document.write( "
Algebra.Com's Answer #156646 by rfer(16322)\"\" \"About 
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y=x+12
\n" ); document.write( "2x+2y=144
\n" ); document.write( "--------------
\n" ); document.write( "2x+2(x+12=144
\n" ); document.write( "2x+2x+24=144
\n" ); document.write( "4x=120
\n" ); document.write( "x=30
\n" ); document.write( "---------------
\n" ); document.write( "y=42
\n" ); document.write( "--------------
\n" ); document.write( "proof
\n" ); document.write( "2(30)+2(42)=144
\n" ); document.write( "60+84=144 \n" ); document.write( "
\n" );