Question: In Problems, use the simplex method to find the optimal solution. Assume that all variables are nonnegative. Minimize f = 4x + y subject to

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

Minimize f = 4x + y subject to
                                 -x + y ≤ 4
                                 3x + y ≥ 12
                                 x + y ≤ 20

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