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Linear Algebra: Orthogonal Columns$\newline$Let $\newline$$M$ be$\newline$ \begin{matrix} 1 & 3 & 1\ 2 & -2 & a\ 1 & 1 & b \end{matrix} $\newline$and let $\newline$$a$ and $\newline$$b$ be such that the columns of $\newline$$M$ are orthogonat. Compute $\newline$$a$$\newline$Pick ONE option$\newline$$-\frac{1}{2}$$\newline$$-1$$\newline$$\frac{1}{2}$$\newline$$2$$\newline$Clear Selection