document.write( "Question 285491: 4x+y-z=8
\n" ); document.write( "x-y+2z=3
\n" ); document.write( "3x-y+z=6\r
\n" ); document.write( "\n" ); document.write( "I am not even sure where to start with this problem.... \n" ); document.write( "
Algebra.Com's Answer #206974 by checkley77(12844)\"\" \"About 
You can put this solution on YOUR website!
4x+y-z=8 add equations 1 & 3
\n" ); document.write( "x-y+2z=3
\n" ); document.write( "3x-y+z=6
\n" ); document.write( "4x+y-z=8
\n" ); document.write( "----------
\n" ); document.write( "7x=14
\n" ); document.write( "x=14/2
\n" ); document.write( "x=2 ans.
\n" ); document.write( "Replace x with 2 in equation 2 & 3
\n" ); document.write( "2-y+2z=3
\n" ); document.write( "-y+2z=3-2
\n" ); document.write( "-y+2z=1 subtract this equation from the last equation.
\n" ); document.write( "3*2-y+z=6
\n" ); document.write( "6-y+z=6
\n" ); document.write( "-y+z=6-6
\n" ); document.write( "-y+z=0
\n" ); document.write( "-(-y+2z=1)
\n" ); document.write( "--------------
\n" ); document.write( "-z=-1
\n" ); document.write( "z=1 ans.
\n" ); document.write( "4*2+y-1=8
\n" ); document.write( "8+y-1=8
\n" ); document.write( "y=8-8+1
\n" ); document.write( "y=1 ans.
\n" ); document.write( "x,y,z (2,1,1)\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );