2. Use Gauss elimination with back substitution to solve the system of linear equations: | 4x, - 3x, +x3 +2x, = 8.5 | 2.5x, + 5x 2 – 2x 3 +x4 =-10.2 -x, - 6x; - 3x, =-6.4 (2x, +2x, +x, - 5x, = 12.6 4

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