Question 788795
2	x	+	3	y	=	1	.............1	
Total value								
5	x	+	7	y	=	3	.............2	
Eliminate	y							
multiply (1)by		-7						
Multiply (2) by		3						
-14	x		-21	y	=	-7		
15	x	+	21	y	=	9		
Add the two equations								
1	x				=	2		
/	1							
x	=	2						
plug value of			x	in (1)				
2	x	+	3	y	=	1		
4		+	3	y	=	1		
			3	y	=	1		-4
			3	y	=	-3		
				y	=	-1