Question 539556
 If the coordinates of A and B are ( x1, y1) and ( x2, y2) respectively, then the midpoint, M, of AB is given by the following formula 														
(	-3	,	4	)  	(	7	,	-6	)   					
M(x,y) =		{{{(x1+x2)/2			}}}	{{{	(y1+y2)/2}}}							
x= 	(	-3	+	7	)/	2	y=	(	4		-6	)/	2	
x= 	2		,y=	-1										
Midpoint (2,-1)
Slope of this line 
x1		y1	x2	y2				
-3	*	4	7	-6				
								
slope m =		(y2-y1)/(x2-x1)						
(	-6	-	4	)/(	7	-	-3	) 
(	-10	/	10	)  				
m=		-1      						 


The slope of line perpendicular to this line will be 1 
and it passes through (2,-1)

m=		1      					
							
Plug value of  the slope  and point 			(	2	,	-1	) in
Y 	=	m	x 	+	b		
-1.00	=	2    	+	b			
b=	-1	-	2    				
b=	-3      						
So the equation  will be							
Y 	=	x 		-3    		
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