Question 471468
3	x		-7	y	=	15	.............1	
-5	x	+	4	y	=	-25	.............2	
								
multiply (1)by 		4						
Multiply (2) by		7						
12	x		-28	y	=	60		
-35	x	+	28	y	=	-175		
Add the two equations								
-23	x				=	-115		
/	-23							
x	=	5   			
plug value of 			x	in (1)				
3	x		-7	y	=	15		
15			-7	y	=	15		
			-7	y	=	15-15
			-7	y	=	0		
				y	=	0	
(5,0) is the solution

...

2	x		-3	y	=	12	.............1		
4	x	+	1	y	=	10	.............2		
									
multiply (1)by 		1							
Multiply (2) by		3							
2	x		-3	y	=	12			
12	x	+	3	y	=	30			
Add the two equations									
14	x				=	42			
/	14								
x	=	3    				
plug value of 			x	in (1)					
2	x		-3	y	=	12			
6			-3	y	=	12			
			-3	y	=	12		-6	
			-3	y	=	6			
				y	=	-2    

	
(3-2)is the solution