Question 591130
2	x	+	1	y	=	8	.............1	
-1	x	+	1	y	=	-7	.............2	
Eliminate	y							
multiply (1)by		-1						
Multiply (2) by		1						
-2	x		-1	y	=	-8		
-1	x	+	1	y	=	-7		
Add the two equations								
-3	x				=	-15		
/	-3							
x	=	5      						
plug value of			x	in (1)				
2	x	+	1	y	=	8		
10    		+	1	y	=	8		
			1	y	=	8		-10      
			1	y	=	-2      		
				y	=	-2      

(-3,-2)