问题描述：
Multiple-Choice:Given that a triangle with vertices A(2,1),B(4,5),and C(6,1) is reflected across
the y-axis,what will be the coordinates of the image of
(a) (-5,4) (b) (-4,5) (c) (4,-5) (d) (5,-4)
the y-axis,what will be the coordinates of the image of
(a) (-5,4) (b) (-4,5) (c) (4,-5) (d) (5,-4)
问题解答：
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