OIM 2018 Problem 3
In a plane we have lines, no two of which are parallel or perpendicular, and no three of which are concurrent. A cartesian system of coordinates is chosen for the plane with one of the lines as the -axis. A point is located at the origin of the coordinate system and starts moving along the positive -axis with constant velocity. Whenever reaches the intersection of two lines, it continues along the line it just reached in the direction that increases its -coordinate. Show that it is possible to choose the system of coordinates in such a way that visits points from all lines.
Dataset text AI-MO AoPS. Quoted with source.
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