Here's a convenient method for generating vector-graphic LateX equations for Microsoft Powerpoint presentations
You can generate a pdf on your machine which is cropped around a single equation with this LaTeX template
\documentclass[border=0pt,varwidth,fleqn]{standalone}
\usepackage{amsmath,amssymb}
\begin{document}
\setlength{\mathindent}{0pt}
\noindent
\begin{gather*}
E = m c^2
\end{gather*}
\end{document}
Rendering this, for example in TeXStudio, will create a pdf file you can then copy and paste directly into your Powerpoint file.
The equation will be light (you can add many without slowing powerpoint down), scalable (you can resize it with no loss it quality)
and can even be recoloured in the Picture Format > Color
menu.