Elementary row Operations

Q. The rank of the matrix $\left[\begin{array}{cccc}6& 0& 4& 4\\ -2& 14& 8& 18\\ 14& -14& 0& -10\end{array}\right]$ is ______ .

1. 2

Q. The rank of the matrix $\left[\begin{array}{ccc}-4& 1& -1\\ -1& -1& -1\\ 7& -3& 1\end{array}\right]$ is

1. 1
2. 2
3. 3
4. 4