Question 498172
2	x	+	1	y	=	4	.............1	
1	x		-1	y	=	2	.............2	
Eliminate y								
multiply (1)by 		1						
Multiply (2) by		1						
2	x		1	y	=	4		
1	x		-1	y	=	2		
Add the two equations								
3	x				=	6		
/	3							
x	=	2      			
plug value of 			x	in (1)				
2	x	+	1	y	=	4		
4		+	1	y	=	4		
			1	y	=	4		-4
			1	y	=	0		
				y	=	0