document.write( "Question 492012: Solve the following systems of equations for both x and y.
\n" ); document.write( "-5x + 3y = -40
\n" ); document.write( "9x - 4y = 72 \n" ); document.write( "
Algebra.Com's Answer #334909 by deborabr(181)\"\" \"About 
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-5x + 3y = -40 *4
\n" ); document.write( "9x - 4y = 72 *3
\n" ); document.write( ".
\n" ); document.write( "-20x + 12y = -160
\n" ); document.write( "27x - 12y = 216 suming
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\n" ); document.write( "7x +0y = 56
\n" ); document.write( "7x = 56
\n" ); document.write( "x = 56/7
\n" ); document.write( "x = 8
\n" ); document.write( "substituting x to find y\r
\n" ); document.write( "\n" ); document.write( "-5x + 3y = -40
\n" ); document.write( "-5*8 + 3y = -40
\n" ); document.write( "-40 + 3y = -40
\n" ); document.write( "3y = -40 + 40
\n" ); document.write( "3y = 0
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