Coordinate geometry, explanation of coordinate geometry, y and x axis, point, ordered pairs.

1. Coordinate Geometry You should know what these mean and be able to use them: Coordinates Ordered pairs X axis Y axis

2. Start with a number line: 0 1 2 3 4 5 6 7 8 9 10 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1

3. Add a vertical number line: 9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7

4. The horizontal number line is called the “ x axis ” | | | | | | | | | | | | | | | | | | | | | -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10

5. The vertical number line is called the “ y axis ” 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- (I remember y is for the up and down axis because the y stretches down.)

6. Put them together! | | | | | | | | | | | | | | | | | | | | | -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 --4 --3 --2 --1 -- -1 -- -2 -- -3 -- -4 -- -5

7. Where the two meet is called the “ origin ” That is zero on both scales. 0

11. The two coordinates come in pairs to tell you the point on the grid. They are an ordered pair. What’s the order? Which is first, x or y?

13. You can also think of running before you climb up or down