1. Points and their Coordinates
Cartesian Plane
René Descartes ( )
y axis
x axis
origin

2. The Cartesian Plane is divided into four quadrants.II I
III IV

3. (5, 6) Plotting Points in the Cartesian Plane
(5, 6) is an example of an ordered pair.
x coordinate
y coordinate
(5, 6) 6 5

4. Plotting Points in the Cartesian Plane
(5, 6) is an example of an ordered pair.
x coordinate
y coordinate
(5, 6)

5. (x, y) It is like entering a hotel … (– 3, 4) (– 3, 4) up the elevator
in the door
up the elevator
(– 3, 4)
(– 3, 4)
left 3
up 4

6. Plot the following points.
A(– 4, 6)
B(2, – 3)
A(– 4, 6)
C(– 6, – 4)
D(7, 3)
D(7, 3)
C(– 6, – 4)
B(2, – 3)
These points all lie in different quadrants.
What do you notice about their coordinates?

7. Plot the following points.
These points all lie on the axes, not in quadrants.
What do you notice about their coordinates?