document.write( "Question 630512: 2x-y+8z=13;3x+4y+5z=18;5x-2y+7z=20;
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Algebra.Com's Answer #396993 by jsmallt9(3759)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Initial matrix\r\n" );
document.write( "       2      -1       8      13\r\n" );
document.write( "       3       4       5      18\r\n" );
document.write( "       5      -2       7      20\r\n" );
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document.write( "Row 1 = Row 1 times 1/2\r\n" );
document.write( "       1    -1/2       4    13/2\r\n" );
document.write( "       3       4       5      18\r\n" );
document.write( "       5      -2       7      20\r\n" );
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document.write( "Row 2 = row 2 + -3 times row 1\r\n" );
document.write( "       1    -1/2       4    13/2\r\n" );
document.write( "       0    11/2      -7    -3/2\r\n" );
document.write( "       5      -2       7      20\r\n" );
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document.write( "Row 3 = row 3 + -5 times row 1\r\n" );
document.write( "       1    -1/2       4    13/2\r\n" );
document.write( "       0    11/2      -7    -3/2\r\n" );
document.write( "       0     1/2     -13   -25/2\r\n" );
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document.write( "Row 2 = Row 2 times 2/11\r\n" );
document.write( "       1    -1/2       4    13/2\r\n" );
document.write( "       0       1  -14/11   -3/11\r\n" );
document.write( "       0     1/2     -13   -25/2\r\n" );
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document.write( "Row 1 = row 1 + (1/2) times row 2\r\n" );
document.write( "       1       0   37/11   70/11\r\n" );
document.write( "       0       1  -14/11   -3/11\r\n" );
document.write( "       0     1/2     -13   -25/2\r\n" );
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document.write( "Row 3 = row 3 + (-1/2) times row 2\r\n" );
document.write( "       1       0   37/11   70/11\r\n" );
document.write( "       0       1  -14/11   -3/11\r\n" );
document.write( "       0       0 -136/11 -136/11\r\n" );
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document.write( "Row 3 = Row 3 times -11/136\r\n" );
document.write( "       1       0   37/11   70/11\r\n" );
document.write( "       0       1  -14/11   -3/11\r\n" );
document.write( "       0       0       1       1\r\n" );
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document.write( "Row 1 = row 1 + (-37/11) times row 3\r\n" );
document.write( "       1       0       0       3\r\n" );
document.write( "       0       1  -14/11   -3/11\r\n" );
document.write( "       0       0       1       1\r\n" );
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document.write( "Row 2 = row 2 + (14/11) times row 3\r\n" );
document.write( "       1       0       0       3\r\n" );
document.write( "       0       1       0       1\r\n" );
document.write( "       0       0       1       1\r\n" );
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\n" ); document.write( "So x = 3, y = 1 and z = 1 (from the last column). \n" ); document.write( "
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