Answer:
y= -2
Step-by-step explanation:
The line y = -2 is half way between the 2 shapes (there are 3 squares between the line).
If you were to have a mirror and place it down this line, you would be able to see that the shapes are reflected in the exact same place.
I have attached a photo to help demonstrate what y= -2 looks like :)
Hope this helps!
