1 1 0 l 9

0 1 1 l 7

0 0 0 l 0

Basically this is in a problem that says use Gauss jordan elination to solve the following system:

x1 + x2 = 9

x2 + x3 = 7

2x1 + x2 -x3 = 11

That is the end of elementary operations. To solve using gauss jordan elimination don't you have to work it all the way toreducedechelon form? The second row's leading coef. has a 1 above it so how is it reduced ech form? Doesn't reduced ech form have to have zeroes above all leading coefficents?