Lesson 3.13 Collinearity.

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Presentation transcript:

Lesson 3.13 Collinearity

Homework Lesson 3.13 _pg 264_ #1 & 6

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

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

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

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.

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

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