(a) State which of the following matrices are in row-reduced form: 1 0 4 -1 1 -1 0 - - ( ) --- () --( H A 0 1 2 B 0 1 2-2 C 0 01 00 1 0 001 0 For each matrix that is not in row-reduced form, explain why not a determine its row-reduced form. (b) (i) Solve the following system of linear equations by reducing its augmented matrix to row-reduced form: 2x + y = 1

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