I am missing something. https://www.coursera.org/learn/machine-learning-linear-algebra/lecture/fXzI7/solving-systems-of-equations-with-more-variables

When he reduces down to remove ‘a’ he does row2-row1 and row3-row1(subtracting up) to get row2 and row3 only having b and c. But when he reduces down to remove ‘b’ from row 2 and row 3, he does row2-row3 (subtracting down) instead of row3-row2 (subtracting up like the first reduction).

Does it matter which way you subtract rows? Does it need to be consistent? or do you subtract up always unless you are left with 2 rows where you would then subtract down?

anyone know what my confusion could be?