Question 785782
x= 	Number of	$10 bills						
y=	Number of	$ 20 bills						
 								
1	x	+	1	y	=	20	.............1	
Total value								
10	x	+	20	y	=	300	.............2	
Eliminate	y							
multiply (1)by		-20						
Multiply (2) by		1						
-20	x		-20	y	=	-400		
10	x	+	20	y	=	300		
Add the two equations								
-10	x				=	-100		
/	-10							
x	=	10						
plug value of			x	in (1)				
1	x	+	1	y	=	20		
10		+		y	=	20		
				y	=	20		-10
				y	=	10		
				y	=	10		
x=	10		Number of	$10 bills				
y=	10		Number of	$ 20 bills				
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