Geometry

Question Analysis：  
This question involves reflecting a point across the line y = x.  
The main focus is on understanding how the coordinates of a point change when it is reflected over this diagonal line.

Key Concept Explanation:
When a point is reflected across the line y = x, its coordinates are swapped.  
So, the image of the point becomes (y, x).  
This reflection does not change the signs unless the original point has negative values.

Step-by-Step Solution：
1. Start with the original point: .  
2. To reflect over y = x, swap the coordinates:  
  → becomes

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