Question 775865
x1		y1	x2	y2				
5      		-1      	15      	4    				
								
slope m =		(y2-y1)/(x2-x1)						
(	4    	-	-1    	)/(	15    	-	5    	)
(	5    	/	10    	)  				
m=		  1/ 2						 


slope of a perpendicular line will be the negative reciprocal of the slope of the given line

m=-2