Question is not written properly neigher picture is provided so I rearranged question as follows:
K is mid point of JH where coordinate of the end points are (1,-7) and (9,3). Now question says to find the mid point of the line joining points (1,-7) and (9,3).
Answer:
we just need to apply mid point formula:
Mid point

There (x1,y1) and (x2,y2) are the given end points. So plug the given values.



Hence final answer is (5,-2).