in RxR, let (x,y)R(u,v) if a(x^2)+b(y^2)=a(u^2)+b(v^2) , where a,b >0. Determine if the relation R is an equivalence relation.

I know it has to satify the Reflexive, Symmetry, & Transitive properties but i only did relations with xRy... any hints please(Nerd)