document.write( "Question 183588: 9x+3y=27
\n" ); document.write( "12x-3y=36 \n" ); document.write( "
Algebra.Com's Answer #137812 by checkley77(12844)\"\" \"About 
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9x+3y=27
\n" ); document.write( "12x-3y=36 add these 2 equations.
\n" ); document.write( "-------------------
\n" ); document.write( "21x=63
\n" ); document.write( "x=63/21
\n" ); document.write( "x=3 ans.
\n" ); document.write( "9*3+3y=27
\n" ); document.write( "27+3y=27
\n" ); document.write( "3y=27-27
\n" ); document.write( "3y=0
\n" ); document.write( "y=0 ans
\n" ); document.write( "Proof:
\n" ); document.write( "12*3-3*0=36
\n" ); document.write( "36=36 \n" ); document.write( "
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