Question 871877
1      	x		-1      	y	=	3      	.............1	
Total value								
1      	x	+	2      	y	=	6      	.............2	
Eliminate	y							
multiply (1)by		2      						
Multiply (2) by		1      						
2      	x		-2      	y	=	6      		
1      	x	+	2      	y	=	6      		
Add the two equations								
3      	x				=	12      		
/	3      							
x	=	4      						
plug value of			x	in (1)				
1      	x		-1      	y	=	3      		
4      			-1      	y	=	3      		
			-1      	y	=	3      		-4      
			-1      	y	=	-1      		
				y	=	1