document.write( "Question 1054963: How to solve Write the augmented matrix as a system of equations in TI-84 plus\r
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Algebra.Com's Answer #670182 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
z-d-b=200
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document.write( "Line up like letters\r\n" );
document.write( "Line up the equal sign\r\n" );
document.write( "Line up the numbers on the right sides:\r\n" );
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document.write( "z - d -  b = 200\r\n" );
document.write( "z     + 2b = 250\r\n" );
document.write( "         b = 150\r\n" );
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document.write( "Put 1 coefficients which are usually left understood:\r\n" );
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document.write( "1z - 1d -  1b = 200\r\n" );
document.write( "1z      +  2b = 250\r\n" );
document.write( "           1b = 150\r\n" );
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document.write( "Put in place holder \"+ 0 times the letter\" terms for \r\n" );
document.write( "the missing letters in the second and third \r\n" );
document.write( "equations:\r\n" );
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document.write( "1z - 1d - 1b = 200\r\n" );
document.write( "1z + 0d + 2b = 250\r\n" );
document.write( "0z + 0d + 1b = 150\r\n" );
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document.write( "That can be abbreviated by a matrix by erasing\r\n" );
document.write( "all the letters and putting the - signs close to the \r\n" );
document.write( "numbers, and erasing the + signs. Erase the = signs.\r\n" );
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document.write( "[1   -1   -1   200]\r\n" );
document.write( "[1    0    2   250]\r\n" );
document.write( "[0    0    1   150]\r\n" );
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document.write( "Press 2ND MATRIX (the x-1 key).\r\n" );
document.write( "Highlight EDIT.\r\n" );
document.write( "Press ENTER.\r\n" );
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document.write( "Make it read  MATRIX[A] 3 x 4\r\n" );
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document.write( "type in all the numbers in the above matrix. The\r\n" );
document.write( "brackets \"[\" and \"]\" are already there.\r\n" );
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document.write( "Press 2ND QUIT (the MODE key)\r\n" );
document.write( "Press CLEAR\r\n" );
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document.write( "Press 2ND MATRIX (the x-1 key).\r\n" );
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document.write( "Highlight MATH\r\n" );
document.write( "Scroll with arrow to B:rref(\r\n" );
document.write( "Press ENTER\r\n" );
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document.write( "See rref( followed by blinking cursor.\r\n" );
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document.write( "Press 2ND MATRIX (the x-1 key)\r\n" );
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document.write( "Press ENTER\r\n" );
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document.write( "See rref([A]\r\n" );
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document.write( "Press ) then ENTER\r\n" );
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document.write( "Screen should read\r\n" );
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document.write( "rref([A])\r\n" );
document.write( "  [[1 0 0 -50 ]\r\n" );
document.write( "   [0 1 0 -400] \r\n" );
document.write( "   [0 0 1 150 ]]\r\n" );
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document.write( "This means\r\n" );
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document.write( "1x + 0y + 0z = -50\r\n" );
document.write( "0x + 1y + 0z = -400\r\n" );
document.write( "0x + 0y + 1z = 150\r\n" );
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document.write( "or erasing the placeholder terms and the 1\r\n" );
document.write( "coefficients:\r\n" );
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document.write( " x           = -50\r\n" );
document.write( "      y      = -400\r\n" );
document.write( "           z = 150\r\n" );
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document.write( "Edwin
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