A triangle has vertices A(2, 3), B(6, 3), and C(4, 7). The triangle is reflected across the y-axis. What are the coordinates of A' (the image of A)?
A(-2, 3)
B(2, -3)
C(-2, -3)
D(3, 2)
Explanation
Reflection across the y-axis changes (x, y) to (-x, y). So A(2, 3) becomes A'(-2, 3). The y-coordinate stays the same; only the x-coordinate sign changes.
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