A segment with endpoints (2, -1) and (4, 2) is dilated to the image segment with endpoints (4, -2) And (8, 4).
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Typically if it is a linear function then it doesn't matter. However if it is a quadratic, cubic, and so on and so forth....(
) you may want to used the distance formula if you are not given any other points (with the exception of the vertex, asymptote or roots... etc).