Class file doesn't seem to do fleqn option for beamer properly

Question

I'm trying to do a set of beamer slides with the equations flush left. A minimal example is below. The fleqn option doesn't seem to have any effect. When I combine the class file and tex file into a single file, using \documentclass[fleqn]{beamer}, the equation is flush left, as expected. Presumably I'm making a mistake in my class file, but I can't figure out what it is. Can anyone help? Thanks!

Class file:

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{talk}

\LoadClass[fleqn]{beamer}
\RequirePackage{amsmath}
\setlength{\mathindent}{0pt}

Tex file:

\documentclass{talk}
\begin{document}
\begin{frame}{Foo}
  When in the course
  \begin{equation*}
  x=y
  \end{equation*}
  of human events\ldots
\end{frame}
\end{document}

Answer 1

The option you pass to beamer is not global, so it's not inherited by amsmath, which is loaded by beamer with no option. So you can't load it later.

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{talk}

\PassOptionsToPackage{fleqn}{amsmath}
\LoadClass{beamer}
\setlength{\mathindent}{0pt}

Alternatively

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{talk}

\LoadClass[noamsthm]{beamer}
\RequirePackage[fleqn]{amsmath}
\RequirePackage{amsthm}
\setlength{\mathindent}{0pt}