Brycen plots this graph of y, the number of students left in the classroom x minutes after the bell has rung.

A scatterplot has data points plotted as follows: (1, 12), (2, 10), (3, 9), (4, 9), (5, 7.5), (6, 4), (6.5, 4.5), (7, 3), and (8, 3).
Part A

Which of the following equations describes a reasonable trend line for the data shown in the scatter plot?