For the simplex tableau below:
a) List the basic and non-basic variables
b) Write the corresponding basic feasible solution.
c) Determine whether the optimal solution has been found, an additional pivot is required, or the problem has no optimal solution.

x1 x2 x3 x4 x5 x6 z
0 2 -1 1 4 0 0 5
0 1 2 0 -2 1 0 2
1 3 0 0 5 0 0 11



0 -5 4 0 -3 0 1 27

how do I do this?? :(