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The line m, is a horizontal line with the equation y = -3. Line m serves as the bisector of the segments joining points A to A', B to B', and C to C'. Where the points A', B', and C' are the newly reflected points of the triangle.
Point A is at (2, -2), Point B is at (7, 3), Point C is at (-2, 3).
Point A' is at (2, a), Point B' is at (7, b), and C is at (-2, c), where a, b, and c are the y-coordinates we will solve.
I will use the Midpoint Formula ( -2 + a)/2 = -3 which means the average of the endpoints equals the midpoint coordinate. (-2 + a) = -6, a = -4 Therefore A' is at (2, -4)
(3 + b)/2 = -3,
(3 + b) = -6
b = -9
Therefore B' is at (7, -9)
(3 + c)/2 = -3,
c = -9
Therefore C' is at (-2, -9)
Answer Choice D.) A' (2, -4), B'(7, -9), C' (-2, -9)
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Nov 14th, 2015
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