You are given the following linear programming model in algebraic

You are given the following linear programming model in algebraic form, with x1 and x2 as the decision variables:

Minimize Cost = 40×1 + 50×2

Subject to

Constraint 1: 2×1 + 3×2 ( 30

Constraint 2: x1 + x2 ( 12

Constraint 3: 2×1 + x2 ( 20

And

x1 ( 0 x2 ( 0

a. Use the graphical method to solve this model.

b. How does the optimal solution change if the objective function is changed to Cost = 40×1 + 70 x2?

c. How does the optimal solution change if the third functional constraint is changed to 2×1 + x2 ( 15?

d. Now incorporate the original model into a spreadsheet and use Solver to solve this model.

e. Use Excel to do parts b and c?

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