Posted by Robert on Friday, September 21, 2012 at 9:56am.
numbering the lines 1-4,
#2 - 2*#1, #3 + 2*#1, #4 - 2*#1 gives
1 2 4 6 3
0 -3 -5 -12 -12
0 5 14 16 -5
0 -3 -7 -12 -6
Follow similar steps to place zeros in the other rows off the main diagonal, to end up with
so, (x1,x2,x3,x4) = 1/3 (-23,55,-9,-7)
A good calculator which shows the steps can be found at
www.gregthatcher.com/Mathematics/GaussJordan.aspx
awesome, thanks a lot Steve, that link will come in handy!
sure thing. Plus, I messed up my math. Solution is really (1,1,-3,2)