Mathematics for IGCSE & O level - Transformations (Section 6 - No. 6)

When reflecting a point (x, y) across the line y = -x, what happens to the coordinates?

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

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

(x, y) becomes (y, x)

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

Reflecting across y = -x, the point (x,y) becomes (-y, -x).