use simplex method to maximize the objective function, subject to the given constraints.
19. Objective function: 20. Objective function: z=x 1 +x 2 z=6x 1 +8x 2 Constraints: Constraints: 3x 1 +x 2 ≤432 20x 1 +40x 2 ≤200 x 1 +4x 2 ≤628 30x 1+42x 2 ≤228 x 1 ,x 2 ≥0 x 1 ,x 2 ≥0