Linear Algebra, Spreadsheets.
https://docs.google.com/spreadsheets/d/18hrAL0QFv5wGjPUBEllsR-g_8QbX_YwEmWaE5-digYg/edit?usp=sharing The procedure starts with a given matrix A and transforms it through simple manipulations of its rows (similar to those used in the reduction method) into an upper triangular matrix. The U Step An