Question 563806
2	x	+	7	y	=	3	.............1	
1	x	+	4	y	=	1	.............2	
Eliminate y								
multiply (1)by 		-4						
Multiply (2) by		7						
-8	x		-28	y	=	-12		
7	x		28	y	=	7		
Add the two equations								
-1	x				=	-5		
/	-1							
x	=	5			
plug value of 			x	in (1)				
2	x	+	7	y	=	3		
10		+	7	y	=	3		
			7	y	=	3		-10
			7	y	=	-7		
				y	=	-1