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Math Help - vector from origin to point

  1. #1
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    vector from origin to point

    i have been trying to solve this problem for 2 hours...couldn't get anywhere.

    "consider 2 points located at r1 and r2, seperated by a distance r=|r1-r2|

    find a vector A from origin to a point on the line between r1 and r2 at a distance xr from the point at r1, where x is some number."

    i tried to find an equation for the line r and then tried to solve it with vector A...to find the intersection point...but couldn't get anywhere.

    HELP!!
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  2. #2
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    Quote Originally Posted by silmania View Post
    "consider 2 points located at r1 and r2, seperated by a distance r=|r1-r2|
    find a vector A from origin to a point on the line between r1 and r2 at a distance xr from the point at r1, where x is some number."
    Use the vector defined by the given points: \vec d = r_2  - r_1.<br />
    Then the equation you want is r_1+x\vec d
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