Question 541812
-1	x	+	2	y	=	1	.............1	
-2	x		-1	y	=	7	.............2	
Eliminate 	y							
multiply (1)by 		1						
Multiply (2) by		2						
-1	x		2	y	=	1		
-4	x	+	-2	y	=	14		
Add the two equations								
-5	x				=	15		
/	-5							
x	=	-3						
plug value of 			x	in (1)				
-1	x	+	2	y	=	1		
3		+	2	y	=	1		
			2	y	=	1		-3
			2	y	=	-2		
				y	=	-1		


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