<PRE><B>Question 471402</B>
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    
CHECK									
									
3	x	+	-7	y	=	15			
15			0		=	15			
equation1			15		=	15			
</PRE>