x, + x, - x, + 6x, + x, = -6.4 4x, - x, + x, + Xg = 6.65 x, - x, + x, + 2x, + 7x. - 5x, + x, + x, - x, + X, = -23.15 2х, + х, + 8х, — х, + х, %3D -16.8 X, + 2x, + 8x, + 2x, + X, = 15.95

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A: We use completing square method

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A: The detailed solution is as follows below:

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A: Since you have asked questions with multiple subparts so we will solve first three subparts for you

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Q: The system following system is homogenous system x1 – 2x2 =0 2x1 + x2 = 0

A: See the details solution in below