document.write( "Question 678200: X+y+z=-7
\n" ); document.write( "X+y+2z=3
\n" ); document.write( "5x+y+z=-27 \n" ); document.write( "

Algebra.Com's Answer #421208 by Alan3354(69443) $\"\"$ $\"About$

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X+y+z=-7
\n" ); document.write( "X+y+2z=3
\n" ); document.write( "5x+y+z=-27
\n" ); document.write( "-------------
\n" ); document.write( "X+y+z=-7
\n" ); document.write( "X+y+2z=3
\n" ); document.write( "----------- Subtract
\n" ); document.write( "-z = -10
\n" ); document.write( "z = 10
\n" ); document.write( "============
\n" ); document.write( "x + y + 10 = -7
\n" ); document.write( "x + y = -17
\n" ); document.write( "5x+ y = -37 (from 3rd eqn)
\n" ); document.write( "-------------- subtract
\n" ); document.write( "-4x = 20
\n" ); document.write( "x = -5
\n" ); document.write( "===============
\n" ); document.write( "sub for x & z to find y
\n" ); document.write( " \n" ); document.write( "

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