Question 699745
4	x	+	1	y	=	10	.............1			
1	y	=	10	+	-4	x				
/	1	=								
	y	=	10	+	-4	x				
14	x	+	-1	y	=	-1		.....................2		
Substitute y in		(2)								
14	x	+	-1	(	10	+	-4	x	)	=
14	x	+	-10	+	4	x	=	-1		
14	x		4	x	=	9				
18	x	=	9							
/	18									
x=	  1/ 2									
Plug the value of x in (1)										
4	x	+	1	y	=	10				
4	*	  1/ 2	+	1	y	=	10			
2      	+	1	y	=	10					
1	y	=	8      							
/	1									
y=	8      									
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