Find the Missing Coordinate

Question 1:

A is the coordinate (6,-6). If the midpoint of A and B is (7.5,-6.5), find B.
(9,-7)

Question 2:

A is the coordinate (-8,7) and B is (-1,-10), find the midpoint.
(-4.5,-1.5)

Question 3:

A is the coordinate (-1,0). If the midpoint of A and B is (3,3.5), find B.
(7,7)

Question 4:

A is the coordinate (5,2). If the midpoint of A and B is (3,2), find B.
(1,2)

Question 5:

A is the coordinate (-3,-7). If the midpoint of A and B is (3.5,-2.5), find B.
(10,2)

Question 6:

A is the coordinate (-8,-10). If the midpoint of A and B is (-3.5,-4.5), find B.
(1,1)