If p and q are nonzero integers, which pair of points must lie in the same quadrant? (p, q) and (q, p)
(p, q) and (2p, 2q)
(p, q) and (–p, –q)
(p, q) and (p – 2, q – 2)

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !