To rotate a point \((x, y)\) about the origin by 270 degrees counterclockwise, you can use the following transformation rule:
\[ (x, y) \rightarrow (y, -x) \]
Now, apply this rule to the point \(M(0, 4)\):
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Identify the coordinates of M: \(x = 0\) and \(y = 4\).
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Apply the rotation formula: \[ M' = (y, -x) = (4, -0) = (4, 0) \]
Thus, the image of point \(M\) after a 270-degree counterclockwise rotation about the origin is:
\[ M' = (4, 0) \]