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Mathematics for IGCSE & O level - Transformations (Section 4 - No. 10)

If an object is reflected across the line x = -3, and one vertex is at (1, 4), what are the new coordinates?
(-7, 4)
(1, -10)
(-1, 4)
(-4, 1)

解释

x' = -3 - (1 -(-3)) = -3 - 4 = -7

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