I believe this question ask for the new points after translation. Denoting the point with a ‘ symbol after translation:
A’ = (-4 + 10, 2 – 8) = (6, -6)
B’ = (-7 + 10, 2 – 8) = (3, -6)
C’ = (-7 + 10, 7 – 8) = (3, -1)
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