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12 Let A = 25 2 and let B be the row-reduced echelon form of A. 14 7 Find the first row of matrix

12 Let A = 25 2 and let B be the row-reduced echelon form of A. 14 7 Find the first row of matrix B. 200 Find all (x, y) for which the matrix 0 0 0 is in row-reduced echelon form. 00 y

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