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Transformationsmedium
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A triangle with vertices A(1,2),B(4,2),C(1,6)A(1, 2), B(4, 2), C(1, 6)A(1,2),B(4,2),C(1,6) is reflected across the line x=−1x = -1x=−1. What are the coordinates of the image vertex B′B'B′?