I think your question in correct way is like this:
ST lines on the coordinate plane with S located at (3,2). The midpoint of ST is Z(3,9). Can the location of T be determined? If so, state the location. If not, explain why not.
Answer:
T(3,16)
Explanation:
If two points A(
,
) and B(
,
) are given then the coordinate of midpoint of AB is given by M(
,
).
Similarly coordinates of Z in terms of coordinates of S and T is given by:


Therefore, point T is located at (3,16).