Answer: (1, 2, −3).
- A (1, 2, −3)
- B (−1, −2, 3)
- C (1, −2, 3)
- D (−1, 2, 3)
Correct answer: A. (1, 2, −3)
Explanation: Reflection in the xy-plane negates the z-coordinate, giving (1, 2, −3).
Concept context
Coordinate axes and planes in space, octants, distance between two points, and the section formula
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