To find the image of point Y after a 180° counterclockwise rotation about the origin, we can use the rotation formula for a point \((x, y)\):
\[ (x, y) \rightarrow (-x, -y) \]
Given the coordinates of point Y are \((-2, 6)\), applying the rotation gives us:
\[ Y' = (-(-2), -(6)) = (2, -6) \]
Thus, the coordinates of \(Y'\) after the rotation are \((2, -6)\).