$-2x_1+3x_{2}8$

$x_1+4x_{2}7$

$4-)$

$\{$:$[-2x_1-x_{2}9],[2x_1+3x_{2}3],[minz=3x_1+7x_2]\}$

Take the dual of the linear programming problem. Solve the dual problem. Write the optimal solution of the primal and dual problem from the optimal table of the dual problem