To rotate a point \((x, y)\) about the origin by \(270^\circ\) counterclockwise, we can use the rotation transformation formula:
\[ (x', y') = (y, -x) \]
For point \(M(0, 4)\), we apply the formula:
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Identify \(x\) and \(y\) values from point \(M\):
- \(x = 0\)
- \(y = 4\)
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Apply the rotation transformation:
- \(x' = y = 4\)
- \(y' = -x = -0 = 0\)
Thus, the image of point \(M\) after rotating \(270^\circ\) counterclockwise about the origin is:
\[ M' = (4, 0) \]
So, the answer is:
M' (4, 0)