linear program-Simplex method-Dual problem

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At an exercise I am asked to solve a linear program using the simplex method(in Matlab).Then I have to formulate the dual of this problem and read off an optimal solution of the dual problem from the final tableau of Simplex. What do I have to do? I have done the Simplex method and found the final tableau. But what is meant with "read off an optimal solution of the dual problem from the final tableau of Simplex"?