# What is the slope of any line perpendicular to the line passing through #(-8,23)# and #(5,21)#?

##### 1 Answer

See a solution process below:

#### Explanation:

The formula for find the slope of a line is:

Where

Substituting the values from the points in the problem gives:

Let's call the slope of a perpendicular line:

The slope of a line perpendicular to a line with slope

Substituting the slope for the line in the problem gives: