document.write( "Question 243720: Solve by the substitution method.\r
\n" ); document.write( "\n" ); document.write( "x + y = 2
\n" ); document.write( "x + y = -9
\n" ); document.write( "

Algebra.Com's Answer #178527 by checkley77(12844)\"\" \"About 
You can put this solution on YOUR website!
(x=y) CANNOT = (2 & 9) in the same set of 2 equations.
\n" ); document.write( "x + y = 2 or x=2-y
\n" ); document.write( "x + y = -9 replace x with (2-y)
\n" ); document.write( "2-y+y=-9
\n" ); document.write( "2+0=-9
\n" ); document.write( "2=9 invalid set of equations.
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