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AMC 10 2021-fall-b Problem 17

  • Paper

Distinct lines ℓ\ell and mm lie in the xyxy-plane. They intersect at the origin. Point P(−1,4)P(-1, 4) is reflected about line ℓ\ell to point P′P', and then P′P' is reflected about line mm to point P′′P''. The equation of line ℓ\ell is 5x−y=05x - y = 0, and the coordinates of P′′P'' are (4,1)(4,1). What is the equation of line m?m? (A) 5x+2y=0(B) 3x+2y=0(C) x−3y=0(D) 2x−3y=0(E) 5x−3y=0(\textbf{A})\: 5x+2y=0 (\textbf{B}) \: 3x+2y=0 (\textbf{C}) \: x-3y=0 (\textbf{D}) \: 2x-3y=0 (\textbf{E}) \: 5x-3y=0

Dataset text NuminaMath-1.5. Quoted with source.

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