You are given the following linear programming model in algebraic
form, with X1 and X2 as the decision variables: Note: Each part is independent
(i.e., any change made in one problem part does not apply to any other parts).
2 X1+ X2>=20
a) Graph the feasible region and label the corner point. Compute the optimal
solution using any method of your choice. Justify your answer and indicate the
optimal solution on your graph. [10 points]
b) How does the optimal solution change if the objective function is changed to
40 X1+70 X2? [10 points]
c) Now your boss tells you “I apologize, but I was just informed that the X2
coefficient is not reliable, Can you tell me how much the X2 coefficient may
change, both up and down, whereby the optimal solution you reported in problem
1(a) remains optimal?” Justify your answer
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