The table shows the number of tickets sold and the profit made at a fundraiser.

tickets sold
profit
2
$18
4
$36
6
$54
8
$72

which describes the relationship between the number of tickets sold and the profit?
each ticket sold yields $8 of profit.
each ticket sold yields $9 of profit.
each ticket sold yields $16 of profit.
each ticket sold yields $18 of profit.