Question: Let A = [ 1 2 0 3 0 0 0 1 1 4 0 1 0 3 2 0 0 0 0 0 ]

Let A = [ 1 2 0 3 0

0 0 1 1 4

0 1 0 3 2

0 0 0 0 0 ]

(a) Is this matrix in row echelon form? If not, perform the necessary elementary row operations to make it so.

(b) What are the free and basic variables of this matrix?

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