Question 567028
3	x	+	5	y	=	21	.............1	
-9	x	+	4	y	=	-6	.............2	
Eliminate y								
multiply (1)by 		-4						
Multiply (2) by		5						
-12	x		-20	y	=	-84		
-45	x		20	y	=	-30		
Add the two equations								
-57	x				=	-114		
/	-57							
x	=	2						
plug value of 			x	in (1)				
3	x	+	5	y	=	21		
6		+	5	y	=	21		
			5	y	=	21		-6
			5	y	=	15		
				y	=	3	

(2,3)