(-3, - 0.5)
The formula to find a midpoint goes as shown below. First take the x coordinates from each set, then add them together. Then take the resulting number and divide that by 2. Which gives you the x coordinate of your midpoint, in this case: -3.
Now repeat this process with the y coordinates from each set. Take both y coordinates, add them together, and divide the sum of them by 2. The result in this case should be: -0.5
Therefore the coordinates of your midpoint are: (-3, -0.5)