I want to pursue both acting and law, but I don’t know whether to major in both or to take one of them as a minor? And what universities even offer both? I really like Yale and I’m willing to work hard to get there, but as far as I know they don’t offer acting classes.

I can't speak to the classes offered at Yale, but there is really no need to major in "law," even if the college you choose has a law or pre-law degree. Almost no lawyers I know did that. Law school teaches you what you need to be a lawyer, and after that, you learn on the job. So pursue your passion. If drama is it, then major in drama and go to law school after to learn those skills.

I may have encouraging news for you. I believe the Yale you are talking about does offer drama classes. https://www.drama.yale.edu/ But please know it is extremely competitive to get into Yale regardless of your major. Certainly apply, but it is always good practice to apply to a number of colleges at the same time. Many will have both fields of study in which you have an interest. Sometimes acting departments are referred to by colleges as acting, drama,or theatrical departments. Search for all of those terms

Generally speaking a law degree will offer more career opportunities but we need great actors as well. Good luck Alyssa.