Find the Missing Coordinate

Question 1:

A is the coordinate (-9,10) and B is (-9,9), find the midpoint.
(-9,9.5)

Question 2:

A is the coordinate (5,6). If the midpoint of A and B is (2.5,5), find B.
(0,4)

Question 3:

A is the coordinate (-10,5) and B is (-10,7), find the midpoint.
(-10,6)

Question 4:

A is the coordinate (9,-6). If the midpoint of A and B is (1.5,-2), find B.
(-6,2)

Question 5:

A is the coordinate (10,-4) and B is (-2,-3), find the midpoint.
(4,-3.5)

Question 6:

A is the coordinate (-1,-9). If the midpoint of A and B is (1,-3), find B.
(3,3)