Question 874213
1.00	x	+	1.00	y	=	80.00	.............1	
								
8.50	x	+	6.00	y	=	555.00	.............2	
Eliminate	y							
multiply (1)by		-6.00						
Multiply (2) by		1.00						
-6.00	x		-6.00	y	=	-480.00		
8.50	x	+	6.00	y	=	555.00		
Add the two equations								
2.50	x				=	75.00		
/	2.50							
x	=	30.00						
plug value of			x	in (1)				
1.00	x	+	1.00	y	=	80.00		
30.00		+		y	=	80.00		
				y	=	80.00		-30.00
				y	=	50.00		
				y	=	50.00		
x=	30		number of	adult tickets				
y=	50		number of	child tickets