## Extended example on mathinput by video

The above video shows how to input:

$$\left( \begin{array}{ccc} a_{11} & a_{12}\\\\ a_{21} & a_{22}\\ \end{array} \right) \cdot \left( \begin{array}{ccc} x_{1}\\\\ x_{2}\\ \end{array} \right) = \left( \begin{array}{ccc} b_{1}\\\\ b_2\\ \end{array} \right)$$

The final code is here:

http://www.mathwit.com/c/index.php/forum/4-University-math/21-Code-and-math-display-at-MathWit-forums

There are a few pauses and error corrections in the video shows that a new user needed a little practice to get around. The last step is code correction, which may not necessary for you.