To return the triangle to its original location, we need to perform the opposite translation of the two given translations. The opposite translation of (-1, 5) is (1, -5) and the opposite translation of (4, -4) is (-4, 4).
So, to find the vector that would return the triangle to its original location, we need to add these opposite translations:
(1, -5) + (-4, 4) = (-3, -1)
Therefore, the vector that would return the triangle to its original location is (-3, -1).