A point has the coordinates (m, 0) and m≠0. Which reflection of the point will produce an image located at open paren 0 comma negative m close paren ?

Reflecting a point across the line y = −x changes its coordinates according to (x, y) → (−y, −x). Applying this to (m, 0) gives (0, −m), the desired image. So the correct choice is a reflection across the line y = −x.

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