Find the maximum value of the objective function and where it occurs, subject to the constraints:
?
Objective function:
?
z = x + 9y
?
Constraints:
?
         x ? 0
         y ? 0
 x + 4y ? 20
   x + y ? 18
?2x + 2y ? 21
?

A. Maximum at (0, 5): 45
B. Maximum at : 
C. No maximum
D. Maximum at (0, 0): 0
E. Maximum at : 

Answer: A

Mathematics

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