Assume that the shadow price of a non-binding “?” constraint is 5.This implies that:

if the right-hand side value of the constraint increases by 1 unit,the objective function value will increase by 5 units if the right-hand side value of the constraint increases by 1 unit,the objective function value will decrease by 5 units if the right-hand side value of the constraint increases by 1 unit,the objective function value will remain unchanged if the right-hand side value of the constraint decreases by 1 unit,the objective function value will increase by 5 units if the objective function coefficient increases by 1 unit,the shadow price will increase by 5 units