(a)[2]
Express $3\begin{pmatrix}1 & -1 \\ 0 & 2\end{pmatrix} - 2\begin{pmatrix}-1 & 1 \\ 2 & 1\end{pmatrix}$ in a single matrix.
(b)[2]
Find the inverse matrix of $\begin{pmatrix}\frac{1}{2} & 1 \\ 0 & 1\end{pmatrix}$.
(c)[2]
Find the matrix $X$ that satisfies $X\begin{pmatrix}3 & 2\end{pmatrix} = \begin{pmatrix}6 & 4\\ -3 & -2\end{pmatrix}$.