Problem Consider the following optimization problem: Max Z = 2x1 + x2 + 2x3 s.t. x1 + x2 = 0 X2 >= 0 x3 >= 0 Solve this three dimensional problem with the graphical solution method. Explain your solution procedure. Hint: you can transform this primal model to the corresponding dual model and solve the resulting dual with the graphical solution method, and finally derive the solution to the primal based on the dual solution and the equations of the models