If y=0, then it follows that x=0. By symmetry if x=0, then y=0. But if this was the case then x^2 + y^2 = 8 could not be, so it is not the case that x=y=0. So you can divide without any concerns.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.