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step by step explanation needed Triangle ABC has vertices A (- 2, 2, 0 ), B (0, 1, - 1 ) and c (- 1,

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Triangle ABC has vertices A (- 2, 2, 0 ), B (0, 1, - 1 ) and c (- 1, 2, - 2). Find the area of the triangle ABC Find the equation for the plane through A, B and C Use the Gaussian elimination method to solve the linear system of equation D + 3 y + z + 3u =9 y tu = 2 3 y +By 2+ 3u = 7 2x + By + Su = 10

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