Question
Using (4,0) as the focus and the vertical line $x=9$ as the directrix, find an equation for the set of all points $(x, y)$ where the distance from the focus to$(x, y)$ is two-thirds the distance from the directrix to $(x, y)$
Step 1
This can be written as: \[d((x,y),(4,0)) = \frac{2}{3}d((x,y),(9,y))\] Show more…
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