Row Reduction with Variables

[stoffer]

Can anyone help me with this. I am asked to solve the following matrix with Row Red. Algorithm,

[ a 3 (1+a) | -a ]
[ 1 a 3 | -2a]
[ 1 1 1 | 0 ]

I get to something like

[ 1 1 1 | 0 ]
[ 0 a-1 2 | -2a]
[ 0 3-a 1 | -a]

but what do I do now?

[matt grime]

if a isn't 1 then you can divide row two by a-1. (if a=1...)