$\qquad x-3y=10$ <br> In the xy plane, the graph of which of the following equations is perpendicular to the graph of the equation above ?

Question

$\begin{array}{1 1} (a)\;3x-y=14 \\(b)\; -3x+y=14\\ (c)\; x+3y=14 \\ (d)\;3x+y=14\end{array}$