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**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

*This question was originally posted in an existing topic. It has been moved to not clutter up the other topic.*

toppimp92 wrote:

how would you do this? i don't know how?

please help me

Why did the vector cross the road?

It wanted to be normal.

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**John E. Franklin****Member**- Registered: 2005-08-29
- Posts: 3,588

Can make out a little bit.

This might be a start to understanding the question.

Click on image to enlarge if not already.

**igloo** **myrtilles** **fourmis**

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**John E. Franklin****Member**- Registered: 2005-08-29
- Posts: 3,588

Oh!! I got a bigger picture of it!!

http://img171.imageshack.us/img171/6977 … oofzt7.png

**igloo** **myrtilles** **fourmis**

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**kylekatarn****Member**- Registered: 2005-07-24
- Posts: 445

John, it would help understanding the problem if you named the vertices of both triangles A,B,C and D in the picture

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**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,306

<bad=<bac+<cad

<bcd=<bca+<acd

<bac=<bca, <cad=<acd

**X'(y-Xβ)=0**

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