document.write( "Question 249056: SOLVE EACH SYSTEM BY SUBSTITUTION
\n" ); document.write( "[x=y-8
\n" ); document.write( "[-x-y=0
\n" ); document.write( "

Algebra.Com's Answer #181457 by tutorcecilia(2152)\"\" \"About 
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x=y-8 [substitue this equation into the second equation wherever there is an \"x\"]\r
\n" ); document.write( "\n" ); document.write( "-x-y=0 [second equation]
\n" ); document.write( "-(y-8)-y=0 [plug-in first equation for \"x\"]
\n" ); document.write( "-y+8-y=0 [solve for the y-value]
\n" ); document.write( "-2y+8=0
\n" ); document.write( "-2y=-8
\n" ); document.write( "-2y/-2=-8/-2
\n" ); document.write( "y=4
\n" ); document.write( "check by plugging \"x\" back into either equation.
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