Using the midpoint concept, it is found that:
The coordinates of point A and point D are (-5, 9) and (7, 1). Point C is the midpoint of AD, hence:
[tex]x_C = \frac{-5 + 7}{2} = 1[/tex]
[tex]y_C = \frac{9 + 1}{2} = 5[/tex]
The coordinates of point C are (1,5).
Point B is the midpoint of AC, hence:
[tex]x_B = \frac{-5 + 1}{2} = -2[/tex]
[tex]y_B = \frac{9 + 5}{2} = 7[/tex]
The coordinates of point B are (-2,7).
You can learn more about the midpoint concept at https://brainly.com/question/10956693