1. Lesson 3.13 Collinearity

2. Homework
Lesson 3.13 _pg 264_ #1 & 6

3. Collinear
Points in a set are collinear if they ALL lie on the same line.

4. These points appear to form a triangle. They are not collinear.

5. These points lie on a horizontal line. They are collinear.

6. Here are a few facts about points and collinearity:
Any two points are always collinear with each other, because you can draw a line that contains them both.
All the points on a line are collinear with each other.
A point that is not on a line CANNOT be collinear with any pair of points on the line.

7. Example 1
Find three points on the graphs of 𝒚=𝟐 𝒙 . Are they collinear?

8. Example 2
Find three points on the graphs of 𝒚+𝟐=𝟐(𝒙−𝟏). Are they collinear?