hi,

im trying to solve a set of equations by guassian elimination,

i got it this far

1 0 -1 2 0

0 1 2 3 0

0 0 0 0 1

sorry havent figured out how to use the maths tags yet.

should i have

X1 -X3 +2X4 = 0

X2 + 2X3 + 3X4 = 0

what about the last row?