\documentclass[12pt]{article}
\usepackage{amssymb,amsmath,amscd,concmath,amsfonts}
\pagestyle{empty}
\begin{document}
\begin{equation*}
\aligned
\dot q &= u \\
\dot Y &= q u^T - u q^T 
\endaligned
\end{equation*}
\end{document}