document.write( "Question 924942: x-9y+4z=1
\n" ); document.write( "-2x+9y-4z=-3
\n" ); document.write( "2x+y-4z=-3\r
\n" ); document.write( "\n" ); document.write( "What does x, y, and z equal! I need to solve either by substitution or elimination \n" ); document.write( "

Algebra.Com's Answer #561212 by stanbon(75887) $\"\"$ $\"About$

You can put this solution on YOUR website!
x-9y+4z=1
\n" ); document.write( "-2x+9y-4z=-3
\n" ); document.write( "2x+y-4z=-3
\n" ); document.write( "-------
\n" ); document.write( "Add 2 times the 1st row to the 2nd row
\n" ); document.write( "Subtract 2 times the 1st row from the 3rd row
\n" ); document.write( "-------------------------------------------------
\n" ); document.write( "x-9y+4z=1
\n" ); document.write( "0-9y+4z=-1
\n" ); document.write( "0+19y-12z=-5
\n" ); document.write( "---------------------
\n" ); document.write( "Add 3 times the 2nd row to the 3rd to get:
\n" ); document.write( "x-9y+4z=1
\n" ); document.write( "0-9y+4z=-1
\n" ); document.write( "0-8y=0=-8
\n" ); document.write( "----------------
\n" ); document.write( "Solve the 3rd equation for \"y\"::
\n" ); document.write( "Add 3 times the 2nd row to the 3rd to get:
\n" ); document.write( "x-9y+4z=1
\n" ); document.write( "0-9y+4z=-1
\n" ); document.write( "y = 1
\n" ); document.write( "------
\n" ); document.write( "Substitute y = 1 into the 2nd equation to solve for \"z\".
\n" ); document.write( "x-9y+4z=1
\n" ); document.write( "z = 2
\n" ); document.write( "y = 1
\n" ); document.write( "-----
\n" ); document.write( "Solve for \"x\":
\n" ); document.write( "x = 2
\n" ); document.write( "----------------
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( "-----------------------\r
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