Mathematics for IGCSE & O level - Transformations (Section 6 - No. 29)
What happens when a figure is reflected in the line y = -x?
(x, y) becomes (-x, y)
(x, y) becomes (y, x)
(x, y) becomes (-y, -x)
(x, y) becomes (-y, x)
Paliwanag
The coordinates (x,y) transform to (-y, -x).