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Mathematics for IGCSE & O level - Transformations (Section 4 - No. 4)

A point at (2, -4) undergoes a reflection in the x-axis. What are the new coordinates?
(-2, 4)
(2, 4)
(-2, -4)
(4, 2)

解释

Reflection in the x-axis (x, y) -> (x, -y).

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