Question 453272
1	x	+	-1	y	=	11	.............1	
3	x	+	2	y	=	123	.............2	
Eliminate y								
multiply (1)by 		2						
Multiply (2) by		1						
2x-2y=22		
3x+2y=123		
Add the two equations								
5x=145		
/5							
x=29						
plug value of 			x	in (1)				
x-y=11 		
29-y=11		
-y=11-29
-1y=-18		
y=18