4. For the following matrices in reduced echelon form write the solutions of the systems for which they are the augmented matrices 1000 0 -2 (a) 0 1 0 0 -4 0 0 0 1 9 0 0 0 00 4 0 (b) 10-5 -6 0 -5 0 1 -6 -3 0 2 0000 1 4

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