An art teacher has $80 to spend on museum tickets for her students. Admission tickets cost $10 per student. The graph shows the linear relationship between y, the amount of money remaining for tickets, and x, the number of students going to the museum.
The art teacher plans to spend all of the money on admission tickets. Which set best represents the domain of the function for this situation?
{80, 70, 60, 50, 40, 30, 20, 10, 0}
{80, 60, 40, 20, 0, -20, -40 }
{0, 1, 2, 3, 4, 5, 6, 7, 8}
{0, 2, 4, 6, 8, 10, 12, 14, 16, 18}