<PRE><B>Question 667169</B>
9	x	+	-1	y	=	45	.............1				
-1	y	=	45	+	-9	x					
/	-1	=									
	y	=	-45	+	9	x					
1	x	+	-1	y	=	13		.....................2			
Substitute y in		(2)									
x-1(-45+9x)=13
x+45-9x=13			
x-9x=-32					
-8x=-32								
/	-8										
x=4      										
Plug the value of x in (1)											
9x-y	=	45					
9	*	4      	+	-1	y	=	45				
36      	+	-1	y	=	45						
-1	y	=	9      								
/	-1										
y=	-9      	

CHECK
x-y=13

4-(-9)=13
									
m.ananth@hotmail.ca											
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