To rotate a point \((x, y)\) 90 degrees counterclockwise around the origin, you can use the formula:
\[ (x', y') = (-y, x) \]
For the point \((-7, 4)\):
- Substitute \(x = -7\) and \(y = 4\) into the formula:
- \(x' = -y = -4\)
- \(y' = x = -7\)
Thus, the new point after a 90-degree counterclockwise rotation is:
\[ \boxed{(-4, -7)} \]