To find the original endpoint of the line segment before the translation, we need to reverse the translation process. The translation involved moving 3 units down and 1 unit to the left.
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The new y-coordinate after moving down 3 units is given as 8. To find the original y-coordinate, we add 3: \[ y_{\text{original}} = 8 + 3 = 11 \]
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The new x-coordinate after moving 1 unit to the left is given as 5. To find the original x-coordinate, we add 1: \[ x_{\text{original}} = 5 + 1 = 6 \]
Combining these values, the original endpoint before the translation was at the point: \[ (6, 11) \]