Question

Determine whether or not the following matrices are in row echelon form or not? ( 12-2 012 001) (12-2 012 001)

Answer 1

Solution:

Given matrix:$\begin{bmatrix}1&2&-2\\ \:0&1&2\\ \:0&0&1\end{bmatrix}$

Here, diagonal elements are already 1, and elements below diagonal are all 0.

Hence, it is already in row echelon form.