Question 572566
x-2y	=10	.............1				
y=10-x	---------2				
Substitute y in		(2)	
2x-5y=25								
2x-5(10	-x)=	25
2x-50+5x=	25			
2x+5x	=75					
7x=75								
/	7										
x=	75/ 7										
Plug the value of x in (1)											
2x-5y	=	25					
2*75/ 7-5y=25				
150/ 7	+	-5y	=	25						
-5	y	=	25/ 7								
/	-5										
y=	-  5/ 7										
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