 In this case, the answer is , since is infeasible, that is, it does not belong to the feasible set.Similarly,
or equivalently

represents the pair (or pairs) that maximizes (or maximize) the value of the objective function , with the added constraint that lie in the interval (again, the actual maximum value of the expression does not matter).In this case, the solutions are the pairs of the form and , where ranges over all integers.