To rotate a point \((x, y)\) counterclockwise about the origin by 180 degrees, you use the following transformation:
\[ (x, y) \rightarrow (-x, -y) \]
For the point \((-6, 4)\):
- Apply the transformation:
- \(x = -6\) becomes \( -(-6) = 6\)
- \(y = 4\) becomes \(-4\)
So, the new point after rotating \((-6, 4)\) counterclockwise about the origin by 180 degrees is:
\[ (6, -4) \]