The only transformation that does not preserve congruence is a translation 7 units down
Transformation is the process of changing the position of an object on an xy-plane.
A reflection preserve the congruence since it only create a mirror image of the figure.
Dilation also preserve congruence since it only enlarges the given figure. The only transformation that does not preserve congruence is a translation 7 units down
Learn more on transformation here: https://brainly.com/question/4289712
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