Mark the optimal solution, if any, on the graph and write the optimal solution clearly $($as we did in class$).$

Do NOT solve the question by computing the objective function value at each corner point and choosing the

best one; instead, use the iso$-$profit lines as we discussed in class.

min,$z=600x_1+400x_2$

$s.t.150x_1+250x_{2}750$

$,4x_1+5x_{2}40$

$,x_1,8$

$,x_{2}6$

$,x_1,x_{2}0$