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Lesson 16
Rectangular coordinate system (Cartesian coordinate system):

two perpendicular number lines in a plane that intersect at the zero
point of each line (origin)

the horizontal number line is the
± ² ³´

the vertical number line is the
µ ± ² ³´

the plane is called the coordinate plane or the
µ
plane

the axes divide the plane into four parts called quadrants
What are the signs of
and
µ
in each quadrant?
Ordered pairs:

points in a rectangular coordinate system

denoted with capital letters

the first value denotes the units to the right (positive) or to the left
(negative) of the origin
?
?
°±
°±±
¶
°±±±
¶
°±²
¶
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the second value denotes the units above (positive) or below
(negative) of the origin

every ordered pair on the
± ² ³´
is of the form
µ ¶ ·¸

every ordered pair on the
¹ ± ² ³´
is of the form
µ·¶ ¹¸
What equation represents the
± ² ³´
?
What equation represents the
¹ ± ² ³´
?
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