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#1 2x+3y+z=7
\n" ); document.write( "#2 1x-4y-z=-3
\n" ); document.write( "#3 3x+1y-2z=14 add.
\n" ); document.write( "------------------
\n" ); document.write( "6x-2z=18
\n" ); document.write( "3x-z=9
\n" ); document.write( "-z=9-3x
\n" ); document.write( "z=3x-9
\n" ); document.write( "#1 2x+3y+3x-9=7
\n" ); document.write( "5x+3y=7+9
\n" ); document.write( "5x+3y=16 multiply by 2
\n" ); document.write( "#2 x-4y-(3x-9)=-3
\n" ); document.write( "-2x-4y+9=-3
\n" ); document.write( "-2x-4y=-3-9
\n" ); document.write( "2x+4y=12 multiply by -5 & add to #1.
\n" ); document.write( "10x+6y=32
\n" ); document.write( "-10x-20y=-60
\n" ); document.write( "--------------------
\n" ); document.write( "-14y=-28
\n" ); document.write( "y=-28/-14
\n" ); document.write( "y=2 ans.
\n" ); document.write( "#1 5x+3*2=16
\n" ); document.write( "5x+6=16
\n" ); document.write( "5x=16-6
\n" ); document.write( "5x=10
\n" ); document.write( "x=10/5
\n" ); document.write( "x=2 ans.
\n" ); document.write( "#3 3*2+2-2z=14
\n" ); document.write( "6+2-2z=14
\n" ); document.write( "8-2z=14
\n" ); document.write( "-2z=14-8
\n" ); document.write( "-2z=6
\n" ); document.write( "z=6/-2
\n" ); document.write( "z=-3 ans.
\n" ); document.write( "Proof:
\n" ); document.write( "# 2 2-4*2-(-3)=-3
\n" ); document.write( "2-8+3=-3
\n" ); document.write( "5-8=-3
\n" ); document.write( "-3=-3 \n" ); document.write( "