To translate rectangle ABDC horizontally by -4 and vertically by +3, we need to apply the translation to each vertex's coordinates. The translation can be expressed as follows:
- Horizontal translation: \(x' = x - 4\)
- Vertical translation: \(y' = y + 3\)
Now let's find the coordinates of point C, which is given as \(C(-5, 1)\).
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Apply the horizontal translation: \[ x' = -5 - 4 = -9 \]
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Apply the vertical translation: \[ y' = 1 + 3 = 4 \]
Thus, after applying both translations, the new coordinates \(C'\) will be: \[ C'(-9, 4) \]
Therefore, the coordinates of C' after the translation are \(\boxed{(-9, 4)}\).