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1. (RREF) Solve the systems by Gauss-Jordan method. State the rank of the matrix of coeffi-cients....

1. (RREF) Solve the systems by Gauss-Jordan method. State the rank of the matrix of coeffi-cients.

(a) x+y+z=46x−y+z=94x+y+2z=10

(b) x+y+2z=02x−y+z=14x+y+5z=1

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