Do you know what digital form the equations are in and if the teacher is writing them or copying from another source?
Some screenreaders support MathML. When LaTeX is converted into a PDF screenreaders generally don't understand it, but they can when converted into HTML5.
$1 The other option is you can draw the equations big with puffy paint or describe them yourself. If the teacher is generating content and the equations are displayed as images they can create alt text with a written description.