1. Graphing / Plotting Points Review

2. Parts of the Coordinate Plane
y - axis
This entire graph is called a coordinate plane
x – axis

3. Ordered Pairs
Any point on the coordinate plane can be described by an ordered pair.
Ordered pairs are written as (x , y )
The x value is called the x – coordinate
The y value is called the y – coordinate

4. The coordinate plane can be divided into 4 quadrants.
Quadrant I
Positive x
Positive y
Quadrant II
Negative x
Positive y
Quadrant III
Negative x
Negative y
Quadrant IV
Positive x
Negative y

5. Plotting Points To graph (plot) a point: 1. Start at the origin (0,0).
2. Look at the x-coordinate
- if it is positive, move right
- if it is negative, move left
3. Look at the y-coordinate
- if it is positive, move up
- if it is negative, move down

6. Example: Plot the point (2, -5)
Steps:
1. Start at (0,0)
2. x-coordinate is positive, so move right
3. y-coordinate is negative so move down
Now you have plotted the point (2, -5)!

7. Example: Write the ordered pair for the point given.
Steps:
1. Start at (0,0)
2. Find the x-coordinate (move right or left)
3. Find the y-coordinate (move up or down)
(-3, -4)

8. Example: Plot the following points and name the quadrant they are in.
1. (-4, 2)
Quadrant II
2. (3, 5)
Quadrant I
3. (-2, -3)
Quadrant III
4. (4, -1)
Quadrant IV

9. Write the ordered pair for each point and the quadrant it is located in.
1. (-4, -5) Quadrant III 3 2
2. (-1, 3) Quadrant II
3. (1, 4) Quadrant I 4
4. (3, 0) No Quadrant 5
5. (5, -2) Quadrant IV 1