How
The following article from Microsoft describes how to create accessible equations using the "equation editor" built in to Microsoft PowerPoint: Equation Editor.
If you are familiar with LaTeX, the following article from Microsoft gives details on using LaTeX syntax within Microsoft PowerPoint: Linear format equations using UnicodeMath and LaTeX in Word.
Verify
Equations created via the equation editor are able to be highlighted with a mouse one character at a time. On the other hand, images of equations cannot.
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