Question 418511
$ 10 tickets x
$ 7.50 tickets = y

Total ticket = 180
value = 1620

x+y=180	.............1	
10x+7.5	y=1620	.............2	
								
multiply (1)by 					-7.5			
Multiply (2) by					1			
-7.5x-7.5y=-1350		
10x+7.5y=1620		
								
Add the two equations								
								
2.5x=270		
								
/2.5							
								
x=108						
								
plug value of x in (1)								
								
1x+y=180		
108+y=180		
y=180-108
y=72