The line x – 4y = 6 is the perpendicular bisector of the segment AB and the co-ordinates of B are (1, 3). Find the co-ordinates of A. -Maths 9th

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Answer :

Co-ordinates of A are \(\bigg(rac{3 imes9+1 imes5}{3+1},rac{3 imes6+1 imes-2}{3+1}\bigg)\) = \(\bigg(rac{32}{4},rac{16}{4}\bigg)\), i.e. (8, 4)Now, \(x\) – 3y + 4 = 0 ⇒ –3y = –\(x\) – 4 ⇒ y = \(rac{x}{3}+rac{4}{3}\)∴ Slope of given line = \(rac{1}{3}\)⇒ Slope of required line = \(rac{1}{3}\)      (Since lines are parallel)∴ Equation of line through (8, 4) with slope = \(rac{1}{3}\) is(y - 4) = \(rac{1}{3}\) (\(x\) - 8)               [Using, y – y1 = m (x – x1)]⇒ 3y – 12 = \(x\) – 8 ⇒ 3y – \(x\) = 4.

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