Answer:
I think I got it right! I think it's x=4
if not I'm sorry :(
To find the area of the shaded part we have to subtract the rectangle area from the triangle area :






And we're done
Have a great day ♡
The image would then be in quadrant 3 because say you "folded" the coordinate plane across the x-axis, then the point attached onto the other side of the plane, the point would be in the 3rd quadrant.
Answer: I think the answer would be -4