To rotate a point \((x, y)\) clockwise about the origin by 90 degrees, you can use the following transformation:
\[ (x, y) \rightarrow (y, -x) \]
Given the point \((-4, -6)\):
- Assign \(x = -4\) and \(y = -6\).
- Apply the transformation:
\[ (-4, -6) \rightarrow (-6, 4) \]
Thus, the new point after rotating \((-4, -6)\) clockwise about the origin by 90 degrees is \((-6, 4)\).
So the answer is:
\((-6, 4)\)