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