Exercise 23: Maths: Vectors and Arrays (Solution)
This is the solution to Exercise 23.
\documentclass[11pt]{scrartcl}
\usepackage{amsmath} % need for pmatrix and \boldsymbol
\renewcommand{\vec}[1]{\boldsymbol{#1}}
\begin{document}
\[
\boldsymbol{A}\vec{x} =
\begin{pmatrix}
0 & 1\\
2 & 3
\end{pmatrix}
\begin{pmatrix}
1\\
2
\end{pmatrix}
=
\begin{pmatrix}
2\\
8
\end{pmatrix}
= \vec{y}
\]
\end{document}