Question 800698
x= 	cost of	cassette						
y=	cost of	CD						
 								
5	x	+	2	y	=	65	.............1	
Total value								
3	x	+	4	y	=	81	.............2	
Eliminate	y							
multiply (1)by		-2						
Multiply (2) by		1						
-10	x		-4	y	=	-130		
3	x	+	4	y	=	81		
Add the two equations								
-7	x				=	-49		
/	-7							
x	=	7						
plug value of			x	in (1)				
5	x	+	2	y	=	65		
35		+	2	y	=	65		
			2	y	=	65		-35
			2	y	=	30		
				y	=	15		
x=	$7		cost of	cassette				
y=	$15		cost of	CD				
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