Consider the linear equations x1 + 2x2 + 4x3 = 4 , 2x1 x2 + x3 = 1 , 2x1 + 3x2 x3 = 2 . (3) The strategy for using row reduction is to make the un-augmented part of the matrix look like the identity matrix as much as possible. Start by trying to get zeroes everywhere below the diagonal: systematically start with the leftmost column, then the 2nd column etc. Next, try to get zeroes above the diagonal, starting with the right most column. Use row reduction to solve the system