document.write( "Question 229223: substitution and elimination
\n" ); document.write( "2x+y=-5
\n" ); document.write( "-x+3y=6 \n" ); document.write( "

Algebra.Com's Answer #170017 by checkley77(12844) $\"\"$ $\"About$

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2x+y=-5
\n" ); document.write( "-x+3y=6 multiply by 2 & add.
\n" ); document.write( "-2x+6y=12
\n" ); document.write( "2x+y=-5
\n" ); document.write( "-----------------
\n" ); document.write( "7y=7
\n" ); document.write( "y=7/7
\n" ); document.write( "y=1 ans.
\n" ); document.write( "2x+1=-5
\n" ); document.write( "2x=-5-1
\n" ); document.write( "2x=-6
\n" ); document.write( "x=-6/2
\n" ); document.write( "x=-3 ans.
\n" ); document.write( "Proof:
\n" ); document.write( "-(-3)+3*1=6
\n" ); document.write( "3+3=6
\n" ); document.write( "6=6 \n" ); document.write( "

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