First, you need to find the coordinates of each point: M, T, J, and K.
M is (9, 8)
T is (-6, -1)
J is (7, 2)
K is (1, -8)
P is the midpoint between M and T.
Q is the midpoint between J and K.
The numbers in italics were derived by adding the absolute values of M + T and J + K and dividing by 2.
7.5 and 4.5
P is T plus the two numbers above.
P = (1.5, 3.5)
3 and 5
Q is K plus the two numbers above.
Q = (4, -3)
Then you just plot them on the graph and draw a line connecting P and Q.
M is the midpoint of line GR.
We know that M is at the origin, (0,0), and one of the points G is at (-8,3).
If M is the midpoint, then that means that R is the same distance away from M as G, although in the opposite direction.
Then we can deduce that R = (8,-3).