you must show three things. R is reflexive, symmetric and transitive

(a) Reflexive: you must show that for all

(b) Symmetric: you must show that for

(c) Transitive: you must show that for

can you do that?

what do you mean E(7,3)? you mean the equivalence class that has the point (7,3) in it?and describe the equivalence class E(7,3).