2. Use Gauss elimination with back substitution to solve the system of linear equations: 8x, +x, +4x; + &x, =5 x, - 7x, – 2x3 – 7x, = 1 7x, - 2x, + 7x, +2x4 =-5 X, +x, +2x; – 6x¸ =-5 Round-off to 5 significant figures.

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