# Identifying the Reduced Row Echelon Form of a Matrix

Algebra Level pending

$\text{rref} (P) = I_{3}$

Which of the following matrices satisfy $$P$$ in the above equation?

A. $$\left[ \begin{array} {ccc} 1 & 3 & 0 \\ -1 & -2 & 1 \\ 0 & 1 & 1 \end{array} \right]$$

B. $$\left[ \begin{array} {ccc} 5 & -1 & 2 \\ 9 & -1 & 1 \\ 1 & -1 & 3 \end{array} \right]$$

C. $$\left[ \begin{array} {ccc} -2 & 0 & 1\\ 7 & 5 & 1 \\ -2 & -1 & -3 \end{array} \right]$$

D. $$\left[ \begin{array} {ccc} -3 & 3 & 6 \\ 2 & -2 & 5 \\ 1 & -1 & 6 \end{array} \right]$$

Notation

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