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Math Help - Question on vector algebra

  1. #1
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    Smile Question on vector algebra

    Hola! Just encountered two questions that I have got no idea to solve....Could anyone help?
    Question on vector algebra-.png Question on vector algebra-b.png

    Thanks all!
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  2. #2
    MHF Contributor

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    Re: Question on vector algebra

    The problem says to use vectors- so do that! Set up a coordinate system so that B is at the origin and the positive x-axis runs through C. Then C is (b, 0) for some number b, and A is (b/2, h) for some number h. Of course, D= (b/2, 0). You can calculate that the line AC is y= -2h/b(x)+ 2h and so can find the equation of the line and vector DE. Continue with that.
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