91
L10
Rectangular Coordinates; Graphs of Equations;
Circle
The
Rectangular Coordinate System
is formed by the
x
−
axis and
y
−
axis.
A plane with the
rectangular
coordinate system
is called the
coordinate plane
or
xy

plane
.
This plane has four quadrants:
For each point
P
in the
xy

plane
, there is a
corresponding ordered pair (
,
)
x y
, where
x
and
y
are
called coordinates of
P
, and we write
( ,
)
P
x y
=
.
Example
: Determine the quadrant(s) in which (
,
)
x y
is
located if
0
x
<
and
0
y
<
2
x
>
and
3
y
=
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