Suppose I've a linear programming problem:
Maximize $2x_1 +x_2 - x_3$ s.t
$ x_1 +2x_2 +x_3 \leq 8 $
$ -x_1 +x_2 -2x_3 \leq 4 $
$ x_1,x_2,x_2 \geq 0 $
and a final tableau:
How could I find the optimal dual variables from this tableau?
I was thinking it could have something to do with complementary slackness, since the first constraint is tight we can know that the the corresponding dual variable is greater than 0.
This is not enough information however, I'm wondering is there any other tricks.
I'm studying for an exam right now so much more interested in a method rather than an answer, maybe some references to text if there's too much to type here.
Thanks a lot.