Let the reduced row echelon form of A be: (this is supposed to be a 3x5 matrix but I have no clue how to make on so if someone could make it easier and do it in the latex)
Row 1 is (1 0 2 0 -2)
Row 2 is (0 1 -5 0 -3)
Row 3 is (0 0 0 1 6)
Determine A if the first,second,and fourth columns of A are:
Column 1 (1 -1 3), col 2 ( 0 -1 1 ), col 4 (1 -2 0).