# Relations equivalence

$f) x^2-5x+6=y^2-5y+6$

$g) x^2+y^2=1$

Decide whether or not it’s a reflexive, symmetric, transitive and equivalence relation. If R is an equivalence relation, describe the equivalence classes.

I guess the first one is an equivalence. But I'm having trouble what are the equivalence classes. For the second one, it's not reflexive since it's not for all x in Z? It's symmetric but not transitive?