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Math Help - Finding a point on a line

  1. #1
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    Finding a point on a line

    Seems I have forgotten how maths works. Perhaps you can help? I have two points, A and B, and an x value, and need to find the y value of a point that lies on a line between A and B.



    Is there an equation for this? Or alternatively this is being used in a computer program, so if you prefer to express a solution as an algorithm that works too, but either way is fine.

    Thanks a lot for any advice.
    I'm sure I used to be able to do this, so perhaps a link to some site that might help me refresh my maths skills wouldn't go astray either.
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  2. #2
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    Crna Gora
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    Re: Finding a point on a line

    Quote Originally Posted by Mauris View Post
    Is there an equation for this? Or alternatively this is being used in a computer program, so if you prefer to express a solution as an algorithm that works too, but either way is fine.
    Equation of the line through two points...:

    y-y_A=\frac{y_B-y_A}{x_B-x_A}(x-x_A)
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