When rotating a point \((x, y)\) clockwise about the origin by 270 degrees, the coordinates transform according to the following rule:
\[ (x, y) \rightarrow (y, -x) \]
This means you swap the x and y coordinates and change the sign of the new x-coordinate (which originally was y).
So, the new point after a 270-degree clockwise rotation would be:
\[ (y, -x) \]