When a triangle is translated, the lengths of its sides do not change. The translation down 4 units and to the left 8 units will only affect the position of the triangle, not the measurements of its sides.
Since the length of side XY is 10 units, the length of side X′Y′, after the translation, remains the same at 10 units.
So, the length of side X′Y′ is 10 units.
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