Question 1180020

x1		y1	x2	y2			
1		-1	-2	2			
							
slope m =		(y2-y1)/(x2-x1)					
(	2	-	-1	)/(	-2	-	1
(	3	/	-3	)  			
m=		-1.00					
							
Plug value of  the slope  and point			(	1	,	-1	) in
Y	=	m	x	+	b		
-1.00	=	-1    	+	b			
b=	-1	-	-1    				
b=	0      						
So the equation  will be							
Y 	=	-      	x