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September 20, 2014

September 20, 2014

Posted by **RERE** on Wednesday, February 10, 2010 at 10:11am.

- Math -
**dongo**, Wednesday, February 10, 2010 at 10:14amPretty easy. Use the fact that the product of the first derivatives of linear functions and their perpendiculars respectively are always -1.

This is:

m'=-1/(1/2)=-2

Since we can choose an arbitrary function with the imposed properties, it suffices to take

g(x)=-2*x

q.e.d.

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