If triangle PQR is reflected over a vertical line of reflection, then the x-coordinate of point R' will be the same as the x-coordinate of point R, but the y-coordinate will have the opposite sign.
Therefore, if the coordinates of point R are (x, y), then the coordinates of point R' will be (x, -y).
Triangle PQR is reflected over a vertical line of reflection to create triangle P'Q'R' What are the coordinates of point R'?
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