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To translate a point or a shape, we simply add or subtract the desired amount from the x and y coordinates.
In this case, we are asked to translate the vertex at (8,-2) 3 units down, so we subtract 3 from the y-coordinate.
The new coordinates would be:
x: 8
y: -2 - 3 = -5
Therefore, the translated vertex would be at (8, -5).