Question 561643
-1	x		-7	y	=	18	.............1	
4	x	+	7	y	=	30	.............2	
Eliminate y								
multiply (1)by 		1						
Multiply (2) by		1						
-1	x		-7	y	=	18		
4	x		7	y	=	30		
Add the two equations								
3	x				=	48		
/	3							
x	=	16			
plug value of 			x	in (1)				
-1	x	+	-7	y	=	18		
-16		+	-7	y	=	18		
			-7	y	=	18	+	16
			-7	y	=	34		
				y	=	-4.86		OR -34/7