<s>[INST] This problem introduces the concept of matrices and its usage in solving systems of linear equations using the Gauss Elimination method. Next, you are required to determine the operations that can be used to transform a given 3x3 matrix into a row echelon form (REF). You will be given different 3x3 matrices in subsequent problems and based on the operations you determine here, you will apply them to transform those matrices into REF using the Gauss Elimination method.[/INST]