Answer to Question #72347 in Calculus for Putri Aulia Salsabila

Question

Given two pointsA(1,2,3), B(7,6,5), let S be the set of all points in (x, y)–plane such that PA is orthogonal to PB, then
(a) S is empty
(b) S contains exactly one point
(c) S contains exactly two points
(d) S is a line segment
(e) S is a circle