Point D'D ′
D, prime is the image of D(-2, 1)D(−2,1)D, left parenthesis, minus, 2, comma, 1, right parenthesis under a reflection across the xxx-axis.
What are the coordinates of D'D
′
D, prime?
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Identify the translation rule on a coordinate plane that verifies that square a(-4, 3), b(-4, 8), c(-9, 3), d(-9, 8) and square a'(-3, 2), b'(-3, 7), c'(-8, 2), d'(-8, 7) are congruent.

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