DESCRIBING SLOPE

Slope can be positive, negative, zero, or undefined. Without doing calculation, you can tell which of these is the case by looking at the graph of a line.

Tell whether the slope of each line is positive, negative, zero, or undefined.

Example 1 : 

Solution : 

The line falls from left to right.

The slope is negative.

Example 2 : 

Solution : 

The line is horizontal.

The slope is 0.

Example 3 : 

Solution : 

The line is vertical.

The slope is undefined.

Example 4 : 

Solution : 

The line rises from left to right.

The slope is positive.

Positive Slope

Negative Slope

Zero Slope

The slope of any horizontal line is zero. 

Undefined Slope

The slope of any vertical line is undefined. 

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