By default, PowePoint does not have a LaTex processor however there is a way to get around it using a free LaTeX add-In for PowerPoint on Windows and Mac. It is called IguanaTex. All you need to do is install the add-in and copy the latex equation you created in Mathpix and paste it into the dialog box of the add-in, and voilà! You are now good to go! The add-in treats the equation as an object which enables you to enlarge or reduce its size easily. It's also possible to copy and paste the equations into other slides and edit them if necessary which again saves you so much time!