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I see, I expanded the squares. I didn't think of square rooting both sides. Thank you. :)

Find the equation of the locus of a point P(x,y) that is subject to the following condition: The distance of a point from the line x=4 is equal to its distance from the line y=1. How do I approach this question? I have tried equating the distances of the points, and was unsuccessful. I don't...