document.write( "Question 712895: 2x-y+-3
\n" ); document.write( "x+y=9
\n" ); document.write( "Please Use Substitution method \n" ); document.write( "
Algebra.Com's Answer #438215 by checkley79(3341)\"\" \"About 
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2x-y=-3 I'll assume the + should have been a = sign.
\n" ); document.write( "x+y=9
\n" ); document.write( "x=9-y
\n" ); document.write( "2(9-y)-y=-3
\n" ); document.write( "18-2y-y=-3
\n" ); document.write( "-3y=-3-18
\n" ); document.write( "-3y=-21
\n" ); document.write( "y=-21/-3
\n" ); document.write( "y=7 ans.
\n" ); document.write( "x+7=9
\n" ); document.write( "x=9-7
\n" ); document.write( "x=2 ans.
\n" ); document.write( "Proof:
\n" ); document.write( "2*2-7=-3
\n" ); document.write( "4-7=-3
\n" ); document.write( "-3=-3\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
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