$($a$)3\mathrm{.}2$ Q$11.[$Using complementary slackness.$]$

$($b$)$ Do $3\mathrm{.}2$ Q$11,$ without using complementary slackness, but using the formula for an optimal solution of the dual derived in

the proof of Strong duality theorem. Hint: Steps are: Add slack variables, compute values of slack variables at the solution

shown, confirm that the optimal solution shown is actually a basic feasible solution of the CFLPP$,$ identify basic variables in

that BFS$,$ find matrix B$,$ finally apply the formula.