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locus in analytic geometry

Source: Spanish Mathematical Olympiad 1984 P6

August 2, 2018
Locusanalytic geometrygeometry

Problem Statement

Consider the circle γ\gamma with center at point (0,3)(0,3) and radius 33, and a line rr parallel to the axis OxOx at a distance 33 from the origin. A variable line through the origin meets γ\gamma at point MM and rr at point PP. Find the locus of the intersection point of the lines through MM and PP parallel to OxOx and OyOy respectively.