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I've attempted this question but not sure if I'm right.. Q) Derive the locus of P(x,y) such that its distance from A(-1,5) is equal to its perpendicular distance from the line y=9. I tried doing this: Let B lie on the line y=9. PA = PB therefore PA^2 = PB^2 (x+1)^2 + (y-5)^2 = (x-x)^2 +...