How to locate a point in the plane ?

Lesson#3
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