Answer
The matrix is not in Row-Echelon Form.
Work Step by Step
There are 3 main rules for a matrix to be in row echelon form:
1. A row of all 0s must be at the bottom.
2. The first non-zero entry in a row must be a 1. This is called the leading 1.
3. The leading 1 in a higher row must be in a column further to the left than a lower leading 1.
For a matrix to be in reduced row echelon form, the rules for row echelon form must be met with the addition of this rule:
4. Every column with a leading 1 must have all 0s above the leading 1.
Rule 3 is not followed because in row 3, the leading one is in the same column as the leading 1 above it. To follow the rule, the leading 1 in row 3 must be to the right of the leading one in row 2.
The matrix is not in Row-Echelon Form.
