Geometry

Question Analysis：
This conceptual question checks if you understand the rule behind reflecting across y = x.

Key Concept Explanation:
The transformation over y = x does not keep any value unchanged — it swaps them.

Step-by-Step Solution：
For any point (x, y), reflecting over y = x gives (y, x).
This applies to all real numbers, regardless of sign.

Option Analysis：
A. False — x changes.
B. False — y also changes.
C. ✅ Correct — the rule is (x, y) → (y, x).
D. Incorrect — reflection doesn’t automatical...