Let $A=\left(\begin{array}{11}1 & 1 \\ 1&1 1 1 & 3 \\ 1 & 1\end{array} ight)$ and $b=\left(\begin{array}{c} \-1 W1-1\end{array} ight)$ a. Find the least squares solution to $A x=b$. b. Determine whether the least squares solution found in part (a) is a solution to $A x=b$. CS. JG.085