In Exercises 9-20, use the simplex method to solve the given linear programming problem. (In each case the objective function is to be maximized.) 10. Objective function: Z = x₁ + x₂ X1 Constraints: x₁ + 2x₂ ≤ 6 3x₁ + 2x₂ = 12 X1, X₂0
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