Question

What is the pre-image of vertex A' if the image shown on the graph was created by a reflection across the line y = x?

(10, –2)
(–10, 2)
(–2, –10)
(2, 10)

Answer 1

Reflection across the line y = x swaps coordinates. Since A' is at (−2, 10), the pre-image A is (10, −2).

Answer: (10, −2)