Attached the solution with work shown.
Answer:
Since both values are negative, it can be found in the 3rd quadrant
<em>Feel free to mark this as brainliest :D</em>
Points are coplanar if they are located on the same plane. A plane is one of the undefined terms in geometry. It is described as a flat surface in a two-dimensional area. If you look at the given figure, find points that are not included in the shaded plane of points A, B and C. That would be point M or point D.