ABSTRACT
PreviewActivity 18.1. LetQ = {(a, b) : a, b ∈ Z and b 6= 0}.Define a relation∼ onQ as follows:
(a, b) ∼ (c, d) if ad = bc.
(a) Find three elements in Q that are related to (1, 2).
(b) Find all of the elements in Q that are related to (0, 1).
