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Mathematics for IGCSE & O level - Transformations (Section 4 - No. 13)

If a point (x, y) is reflected in the line y = -x, what are the new coordinates?
(y, x)
(-y, -x)
(-y, x)
(y, -x)

解释

Reflection across y = -x: (x, y) -> (-y, -x)

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