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Mathematics for IGCSE & O level - Transformations (Section 3 - No. 1)

If a point (x, y) is reflected across the line y = 2, what are its new coordinates?
(x, -y)
(-x, y)
(x, 4 - y)
(4 - x, y)

Selitys

Reflection across y=2: y' = 2 + (2 - y) = 4 - y

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