Answer:
(1,2) - (2,1)
(5,2) - (2,5)
(3,0) - (0,3)
(1,0) - (0,1)
Explanation:
A reflection across y=x means (a,b) to (b,a).
If you are reflecting each point then, each point is going to get reflected.
(1,2) - (2,1)
(5,2) - (2,5)
(3,0) - (0,3)
(1,0) - (0,1)