Coordinate System
Coordinate Plane/System: 
combines two real number lines
perpendicular to each other and that intersect at 0 on
each line. 
RenÃ© Descartes: 
The great French
mathematician/philosopher who developed the coordinate
system. He lived from 15961650. 
Axes: 
the xaxis and yaxis in a coordinate
system. 
Origin: 
the point at which the x and y axes
intersect. 
Quadrants: 
the four regions created by the
intersection of the axes. 
Coordinates: 
an ordered pair that indicates a point of
location. 
Signs of Coordinates in the Plane
In Quadrant 1, the xcoordinate and ycoordinate are both
positive.
In Quadrant 2, the xcoordinate is always negative and the
ycoordinate is always positive.
In Quadrant 3, the xcoordinate and ycoordinate are both
negative.
In Quadrant 4, the xcoordinate is always positive and the
ycoordinate is always negative.
On the xaxis, the ycoordinate is always 0.
On the yaxis, the xcoordinate is always 0.
Quadrants:
