6. let a 3(-6,-5,-4,-3,-2,-1, 0, 1, 2, 3, 4, 5, 6} and define the relation r as: m r n # 3 | (m- n). r is an equivalence relation. list the distinct equivalence classes of r prove that s is an equivalence relation. a2-c2. list four distinct elements in the equivalence class [(3,8)] 7. let a be the set of students at gsu. define the relation s as: x s y is the same age as y 8. let a be the set of all ordered pairs of integers. define a relation r on a as: (a, b) r (c, d)