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Question 6. Assume a model appropriate with LP except for following conditions: (Demonstrate how to reformulate these constraints to appropriate a mixed integer programming model) a. Either inequality 1 or inequality 2 must be valid. X 1 + x 2 + X 3 + x4 5 4 3x1 - X2 - X3 + X4 5 3 b. At least two of the given four constraints must be valid: 5x1 + 3x2 + 3x3 - X4 S 10 2x1 + 5x2 - X3 + 3x4 = 10 -X1 + 3x2 + 5x3 + 3x4 = 10 3x1 - X2 + 3x3 + 5x4 5 10