What is the image of (9,−3)(9, -3)(9,−3) after reflection across the line y=−xy = -xy=−x?
(3,−9)(3, -9)(3,−9)
(9,−3)(9, -3)(9,−3)
(−3,9)(-3, 9)(−3,9)
(−9,3)(-9, 3)(−9,3)