When a figure is translated down 4 units and to the right 3 units, the effect on the coordinates of the vertices can be described as follows:
- Translating right 3 units means that you add 3 to each x-coordinate.
- Translating down 4 units means that you subtract 4 from each y-coordinate.
Therefore, the correct response is: Add 3 units to each x-value and subtract 4 units from each y-value.