Determining the Scalar Factor for Parallel Vector Pairs

State which of the following pairs of vectors are parallel.

1. \(\begin{pmatrix} 14 \\ 18 \end{pmatrix}\) and \(\begin{pmatrix} -7 \\ 9 \end{pmatrix}\)
2. \(\begin{pmatrix} -3 \\ 6 \end{pmatrix}\) and \(\begin{pmatrix} 4 \\ -8 \end{pmatrix}\)
3. \(\begin{pmatrix} 4 \\ -4 \end{pmatrix}\) and \(\begin{pmatrix} -1 \\ 1 \end{pmatrix}\)