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Math Help - not sure if this is actually calculus

  1. #1
    Newbie scouser's Avatar
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    Red face not sure if this is actually calculus

    point P (a,b) is equidistant from the point (4,0) and the y axis.
    Find a relationship between a and b
    merci d'avance
    kop forever
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  2. #2
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    Quote Originally Posted by scouser View Post
    point P (a,b) is equidistant from the point (4,0) and the y axis.
    Find a relationship between a and b
    merci d'avance
    kop forever
    Draw a diagram.

    a = \sqrt{b^2 + (a - 4)^2}.
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  3. #3
    Newbie scouser's Avatar
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    yes, but why? of course i drew a diagram and i have the answer, but i have to know why otherwise i won't learn anything. is mr.fantastic a real person or some program? sorry i'm new...
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  4. #4
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    Quote Originally Posted by scouser View Post
    yes, but why? of course i drew a diagram and i have the answer, but i have to know why otherwise i won't learn anything. is mr.fantastic a real person or some program? sorry i'm new...
    The distance of (a, b) from the y-axis is a (since a > 0. Why?). The distance of (a, b) from (4, 0) is given by the usual distance formula.
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