1. Warm Up
Plot the following numbers on a number line (make number lines in your notes):
-2, 1, -5
0, 2, -4
-3, 3, -2
-1, -5, -8

2. Coordinate Plane

3. Introducing… the Coordinate Plane!

4. x-axis
The x-axis runs left to right.
It goes on forever.

5. y-axis
The y-axis runs up and down.
It goes on forever.

6. The point (0,0) is called the origin.

7. Points
How would we get to the orange point from the origin?

8. We name this point with an ordered pair (-4, 3)
Points
We name this point with an ordered pair (-4, 3)
x-coordinate
y-coordinate

9. Write the ordered pairs for the points on the coordinate plane.
You try!
Write the ordered pairs for the points on the coordinate plane.
Red ( , )
Purple( , )
Green( , )

10. Quadrants
Have you noticed that the coordinate plane has roman numerals on it?
2nd
quadrant
1st
quadrant
3rd
quadrant
4th
quadrant

11. State which quadrant each point falls in.
You try!
State which quadrant each point falls in.

12. Remember, you crawl before you jump!
The x-axis
If you are given an ordered pair, you can plot the point.
(-5, 6)
Remember, you crawl before you jump!

13. You try!
Plot the following points:
(-3, -2)
(1, 4)
(-6, 3)
(4, -5)

14. History of Math
René Descartes invented the coordinate plane, which is why it can also be called the Cartesian Plane. There is a legend that René, sick in bed as a child, came up with the coordinate plane when he tried to describe the location of a fly on the ceiling.