Question 856060
x= 	cost of	hardbound						
y=	cost of	softback						
 								
1	x	+	1	y	=	300	.............1	
Total value								
20	x	+	12	y	=	5080	.............2	
Eliminate	y							
multiply (1)by		-12						
Multiply (2) by		1						
-12	x		-12	y	=	-3600		
20	x	+	12	y	=	5080		
Add the two equations								
8	x				=	1480		
/	8							
x	=	185						
plug value of			x	in (1)				
1	x	+	1	y	=	300		
185		+		y	=	300		
				y	=	300		-185
				y	=	115		
				y	=	115		
x=	185		cost of	hardbound				
y=	115		cost of	softback				
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