Mathematics for IGCSE & O level - Transformations (Section 4 - No. 27)
A shape is reflected in the line y = x. What is the general rule for this transformation?
(x, y) → (y, x)
(x, y) → (-x, y)
(x, y) → (x, -y)
(x, y) → (-x, -y)
Explication
Reflection over y = x swaps the x and y coordinates.