Question 916982
x=	one number						
y=	other number						
 							
1	x	+	1	y	=	12	.............1
							
2	x	+	3	y	=	21	.............2
Eliminate	y						
multiply (1)by		-3					
Multiply (2) by		1					
-3	x		-3	y	=	-36	
2	x	+	3	y	=	21	
Add the two equations							
-1	x				=	-15	
/	-1						
x	=	15      					
plug value of			x	in (1)			
1	x	+	1	y	=	12	
15		+		y	=	12	
				y	=	12	
				y	=	-3	
				y	=	-3	
x=	15		one number				
y=	-3		other number				
m.ananth@hotmail.ca