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2. For each of the following linear systems, obtain a solution by graphical methods, if possible. Explain the results from a geometrical standpoint. a 4x1 - X2 + X3 = 8 2x1 + 5x2 + 2x3 = 3 X1 + 2x2 + 4x3 = 11 b. 4x1 + X2 + 2x3 = 9 2x1 + 4x2 - X3 = -5 X1 + X2 - 3x3 = -9 3. Use the Gaussian Elimination Algorithm to solve the following linear systems, if possible, and deter- mine whether row interchanges are necessary: a X1 - X2 + 3x3 = 2 3x1 - 3x2 + X3 = -1 X1 + 2x2 = 3 b. 2x1 - 1.5x2 + 3x3 = 1 -X1 + 2x3 = 3 4x1 - 4.5x2 + 5X3 = 1 Sp C. X1 + X2 + x4 = 2 2x1 + X2 - X3 + X4 = 1 4x1 - X2 - 2x3 + 2x4 = 0 3x1 - X2 - X3 + 2x4 = -3