Given the coordinates (-2,-7) and the length of the line segment which is 12 units long, then there are at least 12 possible coordinates including (-2,-7). Assume that the line segment is horizontal line, then the coordinates are (-1,-7) , (0,-7) , (1, -7), and so on. If the line segment is vertical line, then you can have (-2, -6) (-2,-5) (-2,-4), so on.