write the coordinates of the vertices after a reflection over the line y=3?

Answer:
L(4,-3) -> L'(4,9)
M(4,3) -> M'(4,3)
N(-4,3) -> N'(-4,3)
K(-4,-3) -> K'(-4,9)
Step-by-step explanation:
Reflection of an object means to flip that object on a line called the axis of reflection or line of reflection or mirror line.
Line of reflection here is y = 3
So, after a reflection over the line y = 3
Co ordinates
L' = (4,9)
M' = (4,3)
N' = (-4,3)
K' = (-4,9)