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8. Use the Gauss-Jordan method to solve this system of equations. You may use your calculator. If there is no solution, explain why; if there are infinitely-many solutions, express them using a parameter. 2x - 2y = -5 2y + z = 0 2x+ z=-7 9. Graph the feasible region for the following set of inequalities. Is the feasible region bounded or unbounded? y S 2x + 3 5x + 3y 2 15 y 21 10. Use the Simplex Method to solve the Linear Programming problem whose initial simplex tableau is shown below. 4 0 0 |16 5 0 1 0 20 -3 -1 -2 0 0 1 |0