Review1 - Question I Using the following constraints and...

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Question I. Using the following constraints and their graphical representation, answer the following multiple- choice questions. The shaded region with corner points A, B, C, D is the feasible region. 1
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1. If the objective function is to Minimize -x + 2y, which of points A, B, C, D is optimal? a. Point A b. Point B c. Point C d. Point D 2. If the objective function is to Maximize 3x + 5y, which of points A, B, C, D will be optimal? 3. At which of the points A, B, C, D does constraint 3 have a surplus (is not binding)? 4. If x – y 2 is added as an additional constraint, which of the points A, B, C and D will still be feasible? 5. Which of the following changes would make the feasible region infeasible (empty)? a. Add y 6 as a new constraint b. Add x + y 5 as a new constraint c. Add x 7 as a new constraint d. Delete constraint 3 6. Which of the following changes would make the feasible region unbounded? 7. Which of the following are components of a mathematical model for decision making? 2
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Which of the following statement(s) on linear programming models is/are correct? I. If a linear programming model has an optimal solution, then the feasible region cannot be empty. II. In order to obtain a feasible solution to an otherwise infeasible problem, some of the constraints must be relaxed. III. Changing the objective function will never make an infeasible problem feasible. 9. Which of the following cannot be a reason for conducting sensitivity analysis? a. Some of the input parameters of the model may not have been known with certainty. b. Some of the input parameters of the model are approximations or estimates. c. The model represents a dynamic environment in which some of the parameters are subject to change by time. d. None of the above.
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