document.write( "Question 1047171: X=-y+7
\n" ); document.write( "X-y=-9 \n" ); document.write( "

Algebra.Com's Answer #662679 by Boreal(15235) $\"\"$ $\"About$

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X=-y+7
\n" ); document.write( "X-y=-9
\n" ); document.write( "x+y=7, adding y to both sides of first. Now add the two.
\n" ); document.write( "2x=-2, the y s disappear
\n" ); document.write( "x=-1 divide by 2 both sides
\n" ); document.write( "substitute into first to get y
\n" ); document.write( "-1=-y+7; y=8
\n" ); document.write( "check (-1,8) in second equation
\n" ); document.write( "-1-8=-9. checks.
\n" ); document.write( "(-1,8) answer \n" ); document.write( "

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