Question 805516
x= Number of advance tickets 
 y= Number of tickets at the door 

 1 x + 1 y = 140 .............1 
 Total value 
 8 x + 14 y = 1720 .............2 
 Eliminate y 
 multiply (1)by -14 
 Multiply (2) by 1 
 -14 x -14 y = -1960 
 8 x + 14 y = 1720 
 Add the two equations 
 -6 x = -240 
 / -6 
 x = 40 
 plug value of x in (1) 
 1 x + 1 y = 140 
 40 + y = 140 
 y = 140 -40 
 y = 100 
 y = 100 
 x= 40 Number of advance tickets 
 y= 100 Number of tickets at the door 
 m.ananth@hotmail.ca