PRACTICAL STEPS INVOLVED IN FORMULATING DUAL PROBLEM FROM THE PRIMAL PROBLEM

The practical steps involved in formulating dual problem from the primal problem are as follows:

Step 1→ Ensure that in case of a maximization problem all constraints are of '≤' type or in case of a minimization problem, all constraints are of '≥' type.If not, adopt the following procedure:

In case of Maximisation Problem

Sign used in Constraints Procedure
1. '≤' type No change is required.
2. '≥' type Convert the '≥' type inequality into '≤' type by changing the signs of all values appearing on left hand side and right hand side, (e.g. '+' sign into '–' sign, '–' sign into '+' sign).
3. '=' type
  1. Convert equality into two inequalities - one having ...

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