The linear programming problem has an unusual characteristic. Select a graph of the solution region for the problem and describe the unusual characteristic. Find the maximum value of the objective function (if possible) and where it occurs.
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Objective function:
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z = x + y
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Constraints:
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x ? 0
y ? 0
-x + y ? 1
-x + 5y ? 7
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A. 
Maximum at (0.5, 1.5): 2
B.
The region determined by the constraints is unbounded. For this unbounded region, there is no maximum value of z.
C.
Maximum at (0, 1): 1
D.
Maximum at (0, 0): 0
E.
Maximum at (1.5, 0.5): 2
Answer: B
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