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Find the locus of the point of intersection of the lines

Source: IMO Longlist 1989, Problem 42

September 18, 2008
analytic geometrygeometry unsolvedgeometry

Problem Statement

Let A A and B B be fixed distinct points on the X X axis, none of which coincides with the origin O(0,0), O(0, 0), and let C C be a point on the Y Y axis of an orthogonal Cartesian coordinate system. Let g g be a line through the origin O(0,0) O(0, 0) and perpendicular to the line AC. AC. Find the locus of the point of intersection of the lines g g and BC BC if C C varies along the Y Y axis. Give an equation and a description of the locus.