Question 522015
-4	x	+	3	y	=	7	.............1	
-4	x		-4	y	=	28	.............2	
Eliminate y								
multiply (1)by 		4						
Multiply (2) by		3						
-16	x		12	y	=	28		
-12	x		-12	y	=	84		
Add the two equations								
-28	x				=	112		
/	-28							
x	=	-4						
plug value of 			x	in (1)				
-4	x	+	3	y	=	7		
16		+	3	y	=	7		
			3	y	=	7		-16
			3	y	=	-9		
				y	=	-3