document.write( "Question 703385: 7x+2y=31
\n" ); document.write( "x-y=-2 \n" ); document.write( "
Algebra.Com's Answer #433493 by checkley79(3341)\"\" \"About 
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7x+2y=31
\n" ); document.write( "x-y=-2 MULTIPLY BY 2 & ADD.
\n" ); document.write( "2X-2Y=-4
\n" ); document.write( "7X+2Y=31
\n" ); document.write( "---------------
\n" ); document.write( "9X=27
\n" ); document.write( "X=27/9
\n" ); document.write( "X=3 ANS.
\n" ); document.write( "7*3+2Y=31
\n" ); document.write( "21+2Y=31
\n" ); document.write( "2Y=31-21
\n" ); document.write( "2Y=10
\n" ); document.write( "Y=10/2
\n" ); document.write( "Y=5 ANS.
\n" ); document.write( "PROOF:
\n" ); document.write( "3-5=-2
\n" ); document.write( "-2=-2 \n" ); document.write( "
\n" );