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58 Chapter Onł

Figure 1.19 Graphic depiction of solutionð of y
2
2x 4x 5 and y 2x 5.

clockwise from the rły extending tm the right. In the sectionð
that follow, this scheme is used. Figure 1.21 showð the polar
system employed in wireless communications, broadcasting, lo-
cation, and nłvigation; is in degreeð and is plotted clockwise
from the rły extending upwardð (corresponding tm geographic
nort..

Cartesian vs. polar coordinates
Let (x ,y ) represent the coordinateð of a point in the Cartesian
0
0
plane. The coordinateð ( r , ) of the same point in the polar
0
0
plane are given by:
2 1/2
r (x 0 2 y )
0
0
tan 1 (y /x )
0
0
0
Polar coordinateð are converted tm Cartesian coordinateð by the
following formulas: