# How may I insert white vertical space between subequations?

I have the following MWE

\documentclass[11pt]{article}
\usepackage{empheq}

\newcommand*\widefbox[1]{\fbox{\hspace{2em}#1\hspace{2em}}}

\begin{document}
\begin{subequations}
\begin{empheq}[box=\widefbox]{align}
a & = b \\
c & = d
\end{empheq}
\end{subequations}
\end{document}


and I'd like to insert some variable-size vertical white space between the subequations to make them look nicer in the box. How may I do this?

## 1 Answer

\documentclass[11pt]{article}
\usepackage{empheq}

\newcommand*\widefbox[1]{\fbox{\hspace{2em}#1\hspace{2em}}}

\begin{document}
\begin{subequations}
\begin{empheq}[box=\widefbox]{align}
a & = b \\[2in]
c & = d
\end{empheq}
\end{subequations}
\end{document}