Question 417999
1x+1y=9	.............1	
1x+3y=15	.............2	
								
multiply (1)by 	-3			
Multiply (2) by	1			
-3x-3y=-27		
1x+3y=15		
								
Add the two equations	
-2x=-12		
/-2	
x=6						
plug value of x in (1)						
1x+1y=9		
6+1y=9		
y=9+-6
y=3		
				y	=	3