document.write( "Question 370279: solve by substitution:
\n" ); document.write( "1: x-y=-8
\n" ); document.write( "y=3x\r
\n" ); document.write( "\n" ); document.write( "2: 2x+y=1
\n" ); document.write( "x=8-3y\r
\n" ); document.write( "\n" ); document.write( "Solve:
\n" ); document.write( "3:x+y=20
\n" ); document.write( "-2x+y=5\r
\n" ); document.write( "\n" ); document.write( "4:3x+y=8
\n" ); document.write( "x-y=12
\n" ); document.write( "

Algebra.Com's Answer #264019 by Alan3354(69443)\"\" \"About 
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