document.write( "Question 1128334: solve by elimination
\n" ); document.write( "x-y-2x=4
\n" ); document.write( "-x+2y+z=1
\n" ); document.write( "-x+y-3z=11 \n" ); document.write( "
Algebra.Com's Answer #744794 by Alan3354(69443)\"\" \"About 
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solve by elimination
\n" ); document.write( " x-y-2z =4 --- Eqn 1
\n" ); document.write( "-x+2y+z=1 --- Eqn 2
\n" ); document.write( "-x+y-3z=11 -- Eqn 3
\n" ); document.write( "----------
\n" ); document.write( "Eliminate 1 of the 3 variables.
\n" ); document.write( "Start with x, since all 3 coefficients are 1 or -1
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\n" ); document.write( " x-y-2z =4 --- Eqn 1
\n" ); document.write( "-x+2y+z=1 --- Eqn 2
\n" ); document.write( "------------------------------ Add
\n" ); document.write( "y + z = 5 --- Eqn A
\n" ); document.write( "---
\n" ); document.write( " x-y-2z =4 --- Eqn 1
\n" ); document.write( "-x+y-3z=11 -- Eqn 3
\n" ); document.write( "---------------------------- Add
\n" ); document.write( "-5z = 15
\n" ); document.write( "z = -3
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\n" ); document.write( "y + z = 5 --- Eqn A
\n" ); document.write( "y - 3 = 5
\n" ); document.write( "y = 8
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\n" ); document.write( " x-y-2z =4 --- Eqn 1
\n" ); document.write( "x - 8 + 6 = 4
\n" ); document.write( "x = 6
\n" ); document.write( "(6,8,-3)\r
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