(3x - 4y) 2

2.4: Row Echelon Form (REF) matrices, Reduced Row Echelon Form (RREF) matrices and Elementary Row Operations. Elementary Row Operations (ERO) 3 basic operations performed on a system of linear equations or the augmented matrix obtained from the system, without changing the solution set. 1. Interchange ($) two rows of the augmented matrix: R $ R : i j...