Answer:
For Gwen:-
x + 10y = 30
x + 15y =  40       - Tristan
if we subtract the above equations:-
we get
5y = 10
y = 2
That is the cost of each ticket is $2.
Step-by-step explanation:
 
        
                    
             
        
        
        
3*3*5 is equal to 45 AND its factors are prime.
:)
        
                    
             
        
        
        
If you mean intersecting lines then...