Question 445895
Video---	x	Cost				
Audio===	y	Cost				
3x+7y=1100	.............1	
4x+5y=1350	.............2	
Eliminate y								
multiply (1)by 		-5						
Multiply (2) by		7						
-15x-35y=-5500		
28x+35y	=9450		
Add the two equations								
13x=3950		
/13							
x= Rs.303.85	Cost of Video 					
plug value of 	x in (1)				
3x+7y=1100	
911.54	+7y=1100		
7	y	=	1100		-911.54
7	y	=	188.46		
y	=Rs.26.92	Audio