Question 728769
x= 	number of adult tickets							
y=	number of child tickets							
Total  sold								
1	x	+	1	y	=	42	.............1	
Total value								
5	x	+	3	y	=	178	.............2	
Eliminate	y							
multiply (1)by		-3						
Multiply (2) by		1						
-3	x		-3	y	=	-126		
5	x	+	3	y	=	178		
Add the two equations								
2	x				=	52		
/	2							
x	=	26      						
plug value of			x	in (1)				
1	x	+	1	y	=	42		
26		+		y	=	42		
				y	=	42		-26
				y	=	16		
				y	=	16      		
x=	26      		number of adult tickets					
y=	16      		number of child tickets					
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