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 and be fixed distinct points on the axis, none of which coincides with the origin and let be a point on the axis of an orthogonal Cartesian coordinate system. Let be a line through the origin and perpendicular to the line Find the locus of the point of intersection of the lines and if varies along the axis. Give an equation and a description of the locus.