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Geometry 11 Online
OpenStudy (anonymous):

? Rectangle ABCD is dilated by a scale factor of 2 with the origin as the center of dilation, resulting in the image ABD′. If the slope of AB¯¯¯¯¯ is -2, what is the slope of A'B'¯¯¯¯¯¯¯ ?

OpenStudy (mathmate):

In a dilation, lines remain parallel between preimage and image, so slopes do not change for whichever the dilation factor.

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