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Math Help - Line reflection - understanding question

  1. #1
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    [SOLVED] Line reflection - understanding question

    Hopefully this is in the right section.

    Little bit of trouble understanding what the question wants.

    Does it mean for example to find the reflection that results in the second equation?

    And even so...i'm a little unsure of the best way to go about it that would be quick...all the methods i'm thinking of would take pages..

    (see attached)

    Thank-you
    Last edited by mr fantastic; January 31st 2011 at 05:31 PM. Reason: Restored deleted question (couldn't restore attachment).
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  2. #2
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    Actually, i've come to realise there's a rotation of pi/2...
    So just curious the method of putting this in the given form(and what exactly the form is...)...it's a little confusing.
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  3. #3
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    L' is orthogonal to L.
    So reflection gives the same line L'.
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  4. #4
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    Quote Originally Posted by zzzoak View Post
    L' is orthogonal to L.
    So reflection gives the same line L'.
    Thankyou for the reply.
    I suppose i'm wondering what exactly x + By + C = 0 is. At the moment i'm thinking it's an equation of a transformation but this doesn't make much sense to me as it's usually done in matrix form.
    EDIT: Is it actually just asking for equation 2 in a kind of different form? (no Ax for example)
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  5. #5
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    \pi(L')= L' is 3x-5y+3=0.
    Dividing by 3 gives
    x-\frac{5}{3}y+1=0.
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  6. #6
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    Quote Originally Posted by zzzoak View Post
    \pi(L')= L' is 3x-5y+3=0.
    Dividing by 3 gives
    x-\frac{5}{3}y+1=0.
    wth, that's all it was? Wanting the second equation in a different form?
    I think i was mass over-complicating...damn...
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