Question 453745
x+y=4	.............1	
x+2y=12	.............2	
Eliminate y								
multiply (1)by 	-2						
Multiply (2) by	1						
-2x-2y=	-8		
x+2y=12		
Add the two equations								
-x=	4		
/-1							
x=-4						
plug value of x	in (1)				
x+y=4		
-4+y=4		
y=4+4
y=8		
y=8