Answer:
431 reserved tickets, 1356 general tickets
Explanation:
4x + 3y = 5792
x + y = 1787
Start with these equations and guess numbers and eventually you'll be right
1000x + 787y =6361 WRONG
700x + 1087y = 6061 WRONG
500 x + 1287y = 5861, close but WRONG
430 x + 1357 y = 5791, very close but WRONG
431 x + 1356y = $5792, CORRECT
431 + 1356 = 1787 tickets sold