In general, a point on the plane can be identified by an ordered pair (x,y).
In the case of Mammoth (point A), notice that it is in the intersection between x=-9 and y=-8; therefore the x-coordinate of Mammoth is -9 and its y-coordinate is y=-8.
Similarly, point F is at the intersection between x=3 and y=8; thus, the coordinates of Spinner are x-coordinate: 3, y-coordinate: 8