In order to create semantically accurate math equations that are accessible to all, check out MathML, the markup language that provides semantic understanding and proper syntax to assistive technologies like screen readers.
Why Not Use an Image With Alt Text?
According to info included in Princeton University's MathML for Accessible Math Markup Tutorial, there is a good reason not to use images to display math equations:
"Whereas an alternative text description on an image of a math equation is better than nothing, it still a violation of Success Criterion 1.4.5 Images of Text. Presenting an equation as an image denies the ability of the non-sighted user to derive the understanding through semantics in an equivalent fashion to a sighted user."
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