To rotate a point (x, y) 270 degrees counterclockwise, you can use the transformation:
\[ (x, y) \rightarrow (y, -x) \]
Given the point \( A(2, 4) \):
- Substitute \( x = 2 \) and \( y = 4 \): \[ (2, 4) \rightarrow (4, -2) \]
Thus, after a 270-degree counterclockwise rotation, the new point is \( (4, -2) \).
The correct response is:
\((4, -2)\)