Given the matrix $A= \displaystyle\left[\begin{array}{ccc} 1 &1 &-3 \cr 0 &1 &0 \cr 0 &0 &0 \cr \end{array}\right]$
(a) determine whether the matrix $A$ is in row echelon form;
Your answer is Choose Yes No
(b) determine whether the matrix $A$ is in reduced row echelon form;
Your answer is Choose Yes No