Question 618355
x-9	y	=	-13	.............1	
								
x+y	=	7	.............2	
Eliminate	y							
multiply (1)by		1						
Multiply (2) by		9						
1	x		-9	y	=	-13		
9	x	+	9	y	=	63		
Add the two equations								
10	x				=	50		
/	10							
x	=	5					
plug value of			x	in (1)				
1	x		-9	y	=	-13		
5			-9	y	=	-13		
			-9	y	=	-13		-5
			-9	y	=	-18		
				y	=	2