In order to reflect a shape over the y-axis, we just have to change the sign of the x-coordinates of its points. In this case, we have an arrow with points A(2,1), B(2,3), C(1, 3), D(3,5), E(5, 3), F(4,3), and G(4, 1). By applying the reflection over the y-axis we get:
A(2,1) -> A'(-2,1)
B(2,3) -> B'(-2,3)
C(1,3) -> C'(-1,3)
D(3,5) ->D'(-3,5)
E(5,3) -> E'(-5, 3)
F(4,3) -> F'(-4,3)
G(4,1) -> G'(-4, 1)
Then, by reflecting the arrow we should get: