Lesson#4 HOW TO LOCATE A POINT IN THE PLANE? LOCATION OF THE POINT IN THE PLANE. HORIZENTAL LINE, VERTICAL LINE. Point X=0, Y=0, Location is Origin. Point Y=0, Location is X-axis. Point X=0, Location is Y-axis Point x>0, Location is Right Half Plane. Point x0, Location is Upper Half Plane. Point y0, y chapter No 4 Introduction to Analytical Geometry Exercise No 4.1