Given the points ( -2 , -5 ) , ( 4 , -1)
The slope = The rise/the run
The rise = the difference of y - coordinates = -1 - (-5) = -1 + 5 = 4
The run = the difference of x - coordinates = 4 - ( -2 ) = 4 + 2 = 6
So, the slope =
The perpendicular slope = m'