Answer:
(-13, -12)
Explanation:
The midpoint (x,y) between two points (
) and (
) on the coordinate plane is given by:

Hence given that house A is at (3, 6) and house B is at (-5, -3). Since house B is placed at the middle of house A and house B, let the coordinates of house C be (
). Hence:


Therefore house C is at (-13, -12)