bab matrik perkalian

a.
[tex]\left[\begin{array}{ccc}1&2\\2&1\end{array}\right] X = \left[\begin{array}{ccc}4&3\\2&1\end{array}\right] \\ \\ X = \frac{1}{1-4} \left[\begin{array}{ccc}1&-2\\-2&1\end{array}\right] \left[\begin{array}{ccc}4&3\\2&1\end{array}\right] \\ \\ X = \frac{1}{-3} \left[\begin{array}{ccc}4-4&3-2\\-8+2&-6+1\end{array}\right] \\ \\ X = \frac{1}{-3} \left[\begin{array}{ccc}0&1\\-6&-5\end{array}\right] \\ \\ X = \left[\begin{array}{ccc}0&-\frac{1}{3}\\2&\frac{5}{3}\end{array}\right][/tex]

b.
[tex]\left[\begin{array}{ccc}-3&1\\4&-2\end{array}\right] X = \left[\begin{array}{ccc}0&-2\\-2&0\end{array}\right] \\ \\ X = \frac{1}{6-4} \left[\begin{array}{ccc}-2&-1\\-4&-3\end{array}\right] \left[\begin{array}{ccc}0&-2\\-2&0\end{array}\right] \\ \\ X = \frac{1}{2} \left[\begin{array}{ccc}2&4\\6&8\end{array}\right] \\ \\ X = \left[\begin{array}{ccc}1&2\\3&4\end{array}\right][/tex]