What is the rule for the reflection?

ry=x(x, y) → (–y, –x)
ry=–x(x, y) → (–y, –x)
ry=x(x, y) → (y, x)
ry=–x(x, y) → (y, x)

What is the rule for the reflection ryxx y y x ryxx y y x ryxx y y x ryxx y y x class=