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Coordinate

Source: 1989 National High School Mathematics League, Exam One, Problem 8

February 25, 2020
analytic geometry

Problem Statement

Line l:2x+y=10l:2x+y=10, line l′l' passes (−10,0)(-10,0), and l′⊥ll'\perp l, then the coordinate of the intersection of ll and l′l' is________.
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