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Algebra, easy problem

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Find the value of k so that the line containing the points (−4,1) and (k,−2) is perpendicular to the line containing the points (−9,5) and (−5,0).

  • Algebra, easy problem - ,

    slope of given line: -5/4
    slope of ┴ line: 4/5

    (-2-1)/(k+4) = 4/5

    solve for k

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