ADDITIONAL VARIABLES USED IN SOLVING LPP - Quantitative Techniques for management

Three types of additional variables are used in simplex method such as,

  1. Slack variables (S1, S2, S3..…Sn): Slack variables refer to the amount of unused resources like raw materials, labor and money.
  2. Surplus variables (-S1, -S2, -S3..…-Sn): Surplus variable is the amount of resources by which the left hand side of the equation exceeds the minimum limit.
  3. Artificial Variables (a1, a2, a3.. …an): Artificial variables are temporary slack variables which are used for purposes of calculation, and are removed later.

The above variables are used to convert the inequalities into equality equations, as given in the following table.

Types of Additional Variables

Types of Additional Variables

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