Mathematics for IGCSE & O level - Transformations (Section 2 - No. 15)
What happens when a point is reflected over the line y = x?
The x and y coordinates stay the same.
The x and y coordinates switch places.
The x coordinate changes sign.
The y coordinate changes sign.
Paliwanag
Reflecting over y = x swaps the coordinates (x, y) -> (y, x).