00:01
Okay, so what we have here is a 2x2 matrix wherein we are asked to find the row echelon form and to determine its round.
00:08
So if we are to review our lessons on row echelon, what we want to do here is to convert the final row to 0, so we only have one non -zero entry point, which is called the pivot.
00:19
So this can be done by doing series of operations, including rescaling a row, adding multiple of one row to the other row, or swapping two rows.
00:28
So for this example, what we want to do first is to swap r1 with r2.
00:37
So if we are to do this, we are going to get negative 4, 8, and 2 negative 4.
00:47
So as mentioned, we want the last row to have zero values.
00:51
So we don't want any non -zero values on the final row...