This is a coordinate plane. It has
two axis and four quadrants. The two number lines form the axes.
The horizontal number line is called the x-axis and the
vertical number line is called the y-axis.

The center of the coordinate plane is called the
origin. It has the coordinates of (0,0).

Locations of points on the plane can be plotted when
one coordinate from each of the axis is used. This set of x and
y values are called ordered pairs.

The French philosopher, mathematician,
and scientist Rene Descartes, was one of the most important and influential
thinkers in history. Descartes founded analytic geometry and originated
the Cartesian coordinates and Cartesian curves. The coordinate plane
is often called the Cartesian plane.