Geometry

Question Analysis:  
This question involves coordinate geometry, specifically a reflection across the diagonal line .  
The main focus is on applying the correct rule for reflecting a point across a diagonal line, not just over the x- or y-axis.

Key Concept Explanation:  
To reflect a point over the line :  
1. Swap the coordinates  
2. Negate both values
So the formula becomes:  


Step-by-Step Solution:  
Original point:
1. Swap the coordinates:  
2. Negate both:  
Therefore, the reflected image is

Common Mistakes:
- Swapping without negating the coordinates  
- Reflecting over the wrong line, such as

Click "Show Answer" to reveal the answer and analysis