1. Cartesian Coordinate System
Origin
X – Axis
Y – Axis
Cartesian Coordinate System
Quadrants
Ordered Pair
Coordinates

2. Terminologies:
Cartesian Coordinate plane
a two-dimensional surface on which a coordinate system has been set up; invented by Rene Descartes; also called Cartesian plane, graph, coordinate grid.

3. a pair of numbers, written as
Coordinates
the numbers in an ordered pair that locate a point in the coordinate plane.
Ordered pair
a pair of numbers, written as
(x, y), that represents a point on a coordinate grid.

4. the horizontal number line on a coordinate grid.
X-axis
the horizontal number line on a coordinate grid.
Y-axis
the vertical number line on a coordinate grid

5. The four parts made by X and Y axis
Quadrants
The four parts made by X and Y axis
Origin
Intersection of X and Y axis

6. y Quadrant 2 Quadrant 1 ( - , + ) ( + , + ) Origin -x x ( - , - )3
( - , + )
( + , + ) 2
Origin 1 -x x -3 -2 -1 1 2 3 -1 -2
( - , - )
( + , - ) -3
Quadrant 3
Quadrant 4 -y

7. y
Plot the point:
1. ( 1, 2) 3 2 1 -x x -3 -2 -1 1 2 3 -1 -2 -3 -y

8. y
Plot the point:
2. ( 2, -3) 3 2 1 -x x -3 -2 -1 1 2 3 -1 -2 -3 -y

9. y
Plot the point:
2. ( -2, 3) 3 2 1 -x x -3 -2 -1 1 2 3 -1 -2 -3 -y

10. y
Plot the point:
2. (-2,-3) 3 2 1 -x x -3 -2 -1 1 2 3 -1 -2 -3 -y