Question 724494
2	x	+	-1	y	=	8	.............1				
-1	y	=	8	+	-2	x					
/	-1	=									
	y	=	-8	+	2	x					
5	x	+	-2	y	=	21		.....................2			
Substitute y in		(2)									
5	x	+	-2	(	-8	+	2	x	)	=	21
5	x	+	16	+	-4	x	=	21			
5	x		-4	x	=	5					
1	x	=	5								
/	1										
x=	5      										
Plug the value of x in (1)											
2	x	+	-1	y	=	8					
2	*	5      	+	-1	y	=	8				
10      	+	-1	y	=	8						
-1	y	=	-2      								
/	-1										
y=	2      										
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