Find the Missing Coordinate

Question 1:

A is the coordinate (-10,-1) and B is (-4,-1), find the midpoint.
(-7,-1)

Question 2:

A is the coordinate (-6,-3) and B is (-7,10), find the midpoint.
(-6.5,3.5)

Question 3:

A is the coordinate (5,-9). If the midpoint of A and B is (1.5,-4.5), find B.
(-2,0)

Question 4:

A is the coordinate (-10,-3) and B is (3,0), find the midpoint.
(-3.5,-1.5)

Question 5:

A is the coordinate (9,1). If the midpoint of A and B is (0,0.5), find B.
(-9,0)

Question 6:

A is the coordinate (0,-4) and B is (-10,-3), find the midpoint.
(-5,-3.5)