Hola! Just encountered two questions that I have got no idea to solve....Could anyone help?

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- October 11th 2011, 07:05 AMjohndoe1314Question on vector algebra
Hola! Just encountered two questions that I have got no idea to solve....Could anyone help?

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Thanks all!http://www.mathhelpforum.com/math-he...isc/pencil.png - October 11th 2011, 08:14 AMHallsofIvyRe: 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.