12. A relation R on a set X-1, 2, 3, 4, 5} defined by the rule (xERif3 divides x-y. List the elements of R and the elements of R 13. Given R-1(1,1), (2,2), (3,3), (4,4), (5,5), (1,3), (3,1)3 is a relation on the set X-11,2,3,4,5). Determine if R is and equivalence relation. Show your work. If you decide R is an equivalence relation then list the equivalence classes