### Question Description

I’m trying to study for my Algebra course and I need some help to understand this question.

Find the coordinates of the vertices formed by the system of inequalities.

x + y ≤ 9

x - 2y ≤ 12

3y ≤ 2x + 3

A. (-6, -9), (10, -1), (2, 7)

B. (-9,- 6), (-1, 10), (7, 2)

C. (-30, -21), (-6, -9), (6, 15)

D. (-6, -9), (6, -3), (-12, -21)