Identifying Different Types of Slopes

There are four types of slopes.

Positive

Negative

Zero

Undefined

We read slopes like we read a book, left to right.

Positive slopes go UP as you go from left to right on a graph.

We read slopes like we read a book, left to right.

Negative slopes go DOWN as you go from left to right on a graph.

We read slopes like we read a book, left to right.

Zero slopes go STRAIGHT ACROSS (HORIZONTAL) as you go from left to right on a graph.

We read slopes like we read a book, left to right.

Undefined slopes go STRAIGHT UP AND DOWN (VERTICAL) as you go from left to right on a graph.