Question 535028
4    	x	+	1	y	=	12	.............1				
-1	y	=	-2		-1	x	---------2				
/	-1	=									
	y	=	2	+	1	x					
Substitute y in 		(1)									
4x+	1	(	2	+	1	x	)	=	12
4    	x	+	2	+	1	x	=	12			
4    	x	+	1	x	=	12	-2				
5	x	=	10								
/	5										
x=	2										
Plug the value of x in (1)											
4    	x	+	1	y	=	12					
4    	*	2	+	1	y	=	12				
8	+	1	y	=	12						
1	y	=	4								
/	1										
y=	4										
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