document.write( "Question 473197: 7x+9y=21
\n" ); document.write( "3x-9y= -81 \n" ); document.write( "

Algebra.Com's Answer #324506 by jim_thompson5910(35256) $\"\"$ $\"About$

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7x+9y=21
\n" ); document.write( "3x-9y= -81
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\n" ); document.write( "10x+0y=-60\r
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\n" ); document.write( "\n" ); document.write( "10x=-60
\n" ); document.write( "x=-60/10
\n" ); document.write( "x=-6\r
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\n" ); document.write( "\n" ); document.write( "3x-9y=-81
\n" ); document.write( "3(-6)-9y=-81
\n" ); document.write( "-18-9y=-81
\n" ); document.write( "-9y=-81+18
\n" ); document.write( "-9y=-63
\n" ); document.write( "y=-63/(-9)
\n" ); document.write( "y=7\r
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\n" ); document.write( "\n" ); document.write( "Answers: x=-6 and y=7
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