Mathematics for IGCSE & O level - Transformations (Section 1 - No. 8)

If an object is reflected over the line y = -x, how do the coordinates change?

(x, y) becomes (-x, -y)

(x, y) becomes (y, x)

(x, y) becomes (-y, -x)

(x, y) becomes (-y, x)

Reflection over y = -x swaps the coordinates and negates them (x, y) -> (-y, -x).