Determine Whether the Planes Are Parallel,orthogonal,or Neither $\begin{array} { l } 3 x - z = 3 \\7 x + y + 21 z = 7\end{array}$

Determine whether the planes are parallel,orthogonal,or neither. $\begin{array} { l } 3 x - z = 3 \\7 x + y + 21 z = 7\end{array}$

A) Neither
B) Parallel
C) Orthogonal