4. Use the information below to respond to Parts A, B, C, and D below. Celeste was selling meal tickets for the holiday program at her school. The cost of a dinner ticket is
$10. She is also selling dessert tickets for $6. She lost track of how many of each ticket she sold,
however, she remembered that she was given 100 tickets and she collected $900.
The system of equations shown can be used to represent this situation:

x + y = 100
(10x + 6y = 900

How many meal tickets for dessert did Cheleste sell?

How much money did Cheleste collect for dinner tickets?