1. What Comes Next Here is a sequence of letters:
O T  T  F  F  S  ____, _____, _____
What 4 letters come next in this sequence?
What does the sequence represent?

2. Solution The next four letters are S, E, N, and T.
Each letter is the first letter of a number written in word form, the numbers being the sequence of natural numbers: One, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten.

3. 3-3 The Coordinate Plane

4. Coordinate Planes Quadrant Two Quadrant One Quadrant Three Quadrant
Y-axis 4 3 2 1 -1 -2 -3 -4
Quadrant
Two
Quadrant
One
X-axis
Quadrant
Three
Quadrant
Four
origin

5. Quadrant Two (-, +) Quadrant One ( +, +) Quadrant Three (-, -)
An ordered pair is a pair of numbers used to locate a point on the coordinate plane.
The ordered pair is always listed with the x-coordinate then the y-coordinate. ( x, y) Ex. (5, -3)
Quadrant
Two
(-, +)
Quadrant
One
( +, +) 4 3 2 1 -1 -2 -3 -4
Quadrant
Three
(-, -)
Quadrant
Four
(+, -)

6. To read or write an ordered pair always locate the x coordinate first.
X -Axis
( 1, )

7. Then locate the y coordinate.4 3 2 1 -1 -2 -3 -4
( 1, 3 )
Y axis

8. The ordered pair at the origin is (0, 0)
What are the ordered pairs for these points?
(3,4)
(-3, 3) 4 3 2 1 -1 -2 -3 -4
(1,1)
(2, -2)
(-4, 0)
(0, -3)

9. Plot the following points on the coordinate plane.
(2, -4) (-1, -1) (3, 2) (-4, 3) 4 3 2 1 -1 -2 -3 -4

10. When will we use this?
The coordinate plane is used to locate places on a map. Lines of latitude and longitude are used.
Hurricane tracking uses the coordinate plane.

11. Summary The coordinate plane is used to plot points on a graph.
There are 4 Quadrants in the coordinate plane.
The x-axis is the horizontal axis, the y-axis is the vertical axis.
Points are written as ordered pairs: (x, y).
To locate a point on a graph locate the
x-coordinate first and then the y-coordinate.

12. Homework- Lesson 3-3 # 2-22 evens
The End
Don’t Forget:
Homework- Lesson 3-3 # 2-22 evens