Question 452469
[1   2  0| -5]
[0   9  0| -9]
[0   0  1| -2]
[-5 -1 9 |-2]
[1   2 6 |-17]
[5 -8 -2 |-3]
-----------------
Interchange the 1st and the 2nd row to get:
[1   2 6 |-17]
[-5 -1 9 |-2]
[5 -8 -2 |-3]
-----------------------
Add 5 times the 1st row to the 2nd row.
Add -5 times the 1st row to the 3rd row.
-----------------------
[1   2 6 |-17]
[0   9 39|-87]
[0 -18 -32|82]
---------------------
Add 2* the 2nd row to the 3rd to get:
[1   2 6 |-17]
[0   9 39|-87]
[0   0 46|-92]
-------------------
Divide thru the 3rd row by 46 to get:
[1   2 6 |-17]
[0   9 39|-87]
[0   0  1| -2]
----------------------
Add -39 times the 3rd row to the 2nd row
Add  -6 times the 3rd row to the 1st row
--------------------------
[1   2  0| -5]
[0   9  0| -9]
[0   0  1| -2]
-----------------
Divide thru the 2nd row by "9":
---------------------------------
[1   2  0| -5]
[0   1  0| -1]
[0   0  1| -2]
----------------------------
Add -2 times the 2nd row to the 1st row:
[1   0  0| -3]
[0   1  0| -1]
[0   0  1| -2]

==========================
Cheers,
Stan H.
=============