Given that triangle ABC was transformed to create triangle A'B'C'.
From the graph we can see that there is no change on the x-axis, but the triangle moved down 7 units, this means there was a movement of -7 on y-axis.
Therefore the rule that best describes this transformation is:
(x, y) ==> (x, y - 7)
ANSWER:
(x, y) ==> (x, y - 7)