(5) Let
A
and
B
be the following row equivalent
4\times 5
matrices.
A=[[1,0,3,1,1],[2,0,3,-1,2],[0,0,1,1,0],[1,0,1,-1,1]],B=[[1,0,2,0,1],[0,0,1,1,0],[0,0,0,0,0],[0,0,0,0,0]]