Find the minimum value of the objective function and where it occurs, subject to the constraints:
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Objective function:
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z = x + 4y
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Constraints:
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x ? 0
y ? 0
x + 4y ? 20
x + y? 18
?2x + 2y ? 21
A. Minimum at (0, 0): 0
B. Minimum at (0, 5): 20
C. Minimum at (0, 18): 72
D. Minimum at 
E. No minimum
Answer: A
Mathematics
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