Question 805519
x= 	Number of	advance tickets						
y=	Number of	tickets at the door						
 								
1    	x	+	1    	y	=	140    	.............1	
Total value								
8    	x	+	14    	y	=	1720    	.............2	
Eliminate	y							
multiply (1)by		-14    						
Multiply (2) by		1    						
-14    	x		-14    	y	=	-1960    		
8    	x	+	14    	y	=	1720    		
Add the two equations								
-6    	x				=	-240    		
/	-6    							
x	=	40    						
plug value of			x	in (1)				
1    	x	+	1    	y	=	140    		
40    		+		y	=	140    		
				y	=	140    		-40    
				y	=	100    		
				y	=	100    		
x=	40    		Number of	advance tickets				
y=	100    		Number of	tickets at the door				
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