The augmented matrix of a system of linear equations has been carried to the following by row

Question:

The augmented matrix of a system of linear equations has been carried to the following by row operations. In each case solve the system.
(a)
The augmented matrix of a system of linear equations has

(b)

The augmented matrix of a system of linear equations has

(c)

The augmented matrix of a system of linear equations has

(d)

The augmented matrix of a system of linear equations has
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