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}