


Description 



Halfplane: The portion of a plane on one side of a line extending on the plane. 
This drawing shows an example of a Cartesian coordinate system. The horizontal
purple line is the xaxis and the vertical green line is the yaxis.
These axes are references from which we can uniquely define a point in the plane.
The xaxis splits the graph into 2 parts called halfplanes. The yaxis
also splits the graph into 2 halfplanes.


