Question 565176
General tickets			x	numbers				
Student tickets			y	numbers				
								
1	x	+	1	y	=	500	.............1	
4	x	+	3	y	=	1720	.............2	
Eliminate y								
multiply (1)by 		-3						
Multiply (2) by		1						
-3	x		-3	y	=	-1500		
4	x		3	y	=	1720		
Add the two equations								
1	x				=	220		
/	1							
x	=	220			
plug value of 			x	in (1)				
1	x	+	1	y	=	500		
220		+	1	y	=	500		
			1	y	=	500		-220
			1	y	=	280		
				y	=	280
General tickets			220    	numbers				
Student tickets			280    	numbers