1. Consider $\left[\begin{array}{rr}1 & -3 2 & 6 7 & -3 3& 4\end{array} ight]\left[\begin{array}{1}x_{1} \ x_{2} \end{array} ight] \equiv\left[\begin{array}{1}1 3 2 1 1\end{array} ight]$ Find the least squares solution of this $5 y_{s} $. tem. Take advantage of the fact that the Iwo columns in the cocfficient matrix are mutually orthogonal. CS.VS. 1591