What is the slope of any line perpendicular to the line passing through #(1,-2)# and #(18,11)#?
See a solution process below:
The slope can be found by using the formula:
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: