lots of writing...
Here is a neat page
http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
tell it you have 3 rows and 4 columns, then enter the values
Notice it takes it all the way to the matrix
1 0 0 ?
0 1 0 ?
0 0 1 ?
you only have to go as far as
1 x x x
0 1 x x
0 0 1 x
get the answer from the last row, sub that back into the second, and finally into the first.
Write the augmented matrix, and then solve the system, using Gauss Jordan elimination on the
augmented matrix.
x + 2y - z = 4
-2x + y - 4z = -6
4x - 3y + 2z = -10
1 answer