To translate point B(6, 4) down by 8 units, you subtract 8 from the y-coordinate of point B.
The original coordinates of point B are (6, 4).
When translated down 8 units:
- The new y-coordinate = 4 - 8 = -4.
The x-coordinate remains the same.
Thus, the coordinates of point B′ after the translation will be:
B′ = (6, -4).