When proving the consistency or inconsistency of a system of equation using matrices:
I'm confused about when to operate my matrix rows into Row Echelon Form or Reduced Row Echelon Form.
I'm asking because I've seen different YouTube videos where they prove the consistency or inconsistency of equations by row operating to row echelon form and in some, by row operating to reduced row echelon form.
Please can anyone clarify when to use either of them?