document.write( "Question 856846: Elimination method
\n" ); document.write( " x + y - z = 4 ЕЕЕЕЕ.(1)
\n" ); document.write( " x Ц 2y + 2z = -5 ЕЕЕЕ.(2)
\n" ); document.write( " 2x Ц y + 2z = -2 ЕЕЕЕ.(3)
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Algebra.Com's Answer #516220 by Fombitz(32388) $\"\"$ $\"About$

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Mutliply eq. 1 by 2 and add to 2.
\n" ); document.write( " $\"2x%2B2y-2z%2Bx-2y%2B2z=8-5\"$
\n" ); document.write( " $\"3x=3\"$
\n" ); document.write( " $\"x=1\"$
\n" ); document.write( "Eq. 2 becomes,
\n" ); document.write( " $\"1-2y%2B2z=-5\"$
\n" ); document.write( "4. $\"-2y%2B2z=-6\"$
\n" ); document.write( "Eq. 3 becomes,
\n" ); document.write( " $\"2-y%2B2z=-2\"$
\n" ); document.write( "5. $\"-y%2B2z=-4\"$
\n" ); document.write( "Subtract eq. 5 from eq. 4,
\n" ); document.write( " $\"-2y%2B2z%2By-2z=-6-%28-4%29\"$
\n" ); document.write( " $\"-y=-6%2B4\"$
\n" ); document.write( " $\"-y=-2\"$
\n" ); document.write( " $\"y=2\"$
\n" ); document.write( "Then,
\n" ); document.write( " $\"-2%2B2z=-4\"$
\n" ); document.write( " $\"2z=-2\"$
\n" ); document.write( " $\"z=-1\"$ \r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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