Question: In Problems, use the simplex method to find the optimal solution. Assume that all variables are nonnegative. Minimize f = 3x + 9y subject to

In Problems, use the simplex method to find the optimal solution. Assume that all variables are nonnegative.

Minimize f = 3x + 9y subject to

        x ≤ 20
        y ≤ 20
  x + y ≥ 21

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