In a LPP, the maximum value of the objective function Z = ax +by is always 0, if origin is one of the corner point of the feasible region.
In the feasible region for a LPP is ..., then the optimal value of the objective function Z= ax + by may or may not exist.
Maximum value of the objective function Z = ax +by in a LPP always occurs at only one corner point of the feasible region.
In a LPP, the objective function is always.
If the feasibile region for a LPP is unbounded, maximum or minimum of the objective function Z = ax + by may or may not exist.
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