Question 718962
-1	x	+	-1	y	=	0	.............1				
-1	y	=	0	+	1	x					
/	-1	=									
	y	=	0	+	-1	x					
6	x	+	-1	y	=	8		.....................2			
Substitute y in		(2)									
6	x	+	-1	(	0	+	-1	x	)	=	8
6	x	+	0	+	1	x	=	8			
6	x		1	x	=	8					
7	x	=	8								
/	7										
x=	8/ 7										
Plug the value of x in (1)											
-1	x	+	-1	y	=	0					
-1	*	8/ 7	+	-1	y	=	0				
-1  1/ 7	+	-1	y	=	0						
-1	y	=	8/ 7								
/	-1										
y=	-8/ 7										
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