document.write( "Question 108313: Solve the system by addition.
\n" ); document.write( " x + y = 9
\n" ); document.write( " x – y = 9
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Algebra.Com's Answer #78943 by edjones(8007)\"\" \"About 
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x+y=9
\n" ); document.write( "x–y=9
\n" ); document.write( "------
\n" ); document.write( "2x=18
\n" ); document.write( ".
\n" ); document.write( "2x/2=18/2
\n" ); document.write( "x=9
\n" ); document.write( "y=0
\n" ); document.write( ".
\n" ); document.write( "Ed
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