Linear programming problem standard form

For developing a general method of solution of a linear programming problem, we used the standard form. The basics of standard form is 

1. Non Negativity Constraints i.e. all the constraints are transformed into equations using the addition and substitution of new non negative constraints and change the equation into standard form. These new varaibles are called as slack or surplus variables and are added if <= sign in constraints and subtract if >= in the constraints.  

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