The coordinates of the vertices of triangle ABC are given in the table.  A	B	C (4,2)(4,2)	(6,7)(6,7)	(13,1)(13,1)    Triangle ABC is reflected across y=−xy=−x .  What are the vertices of triangle A'B'C'?    Enter your answers in the boxes.    A': ( ,  )  B': ( ,  )  C': ( ,  )