
 Economics Interactive 
  Cartesian coordinate: An ordered set of numbers (x,y) that, in twodimensional graphs, identifies how variables may be related graphically along a horizontal xaxis and a vertical yaxis. 
  Cartesian coordinate systems entail two perpendicular lines, or axes, labeled x and y, that usually intersect at their respective zerosâ€”the origin. 
  Coordinates for the following points are depicted in Figure 5: (1, 1), (1, 4), (3, 3), (4, 1), (2, 5), (2, 5), (3, 3), (1, 0), (3, 3), (0, 4), and (3, 3). 
 www.unc.edu /depts/econ/byrns_web/Economicae/Figures/Cartesian.htm (421 words) 
