Question 778466
x= 	Number of	adult tickets						
y=	Number of	child tickets						
 								
1.00	x	+	1.00	y	=	21.00	.............1	
Total value								
5.50	x	+	3.50	y	=	83.50	.............2	
Eliminate	y							
multiply (1)by		-3.50						
Multiply (2) by		1.00						
-3.50	x		-3.50	y	=	-73.50		
5.50	x	+	3.50	y	=	83.50		
Add the two equations								
2.00	x				=	10.00		
/	2.00							
x	=	5.00						
plug value of			x	in (1)				
1.00	x	+	1.00	y	=	21.00		
5.00		+		y	=	21.00		
				y	=	21.00		-5.00
				y	=	16.00		
				y	=	16.00		
x=	5		Number of	adult tickets				
y=	16		Number of	child tickets