Equations of a triangle

Hi,
I am working on some matlab for my engineering classes and I need help with understanding a given diagram.

In the attached diagram, I need help understanding how we determined the equations

For example, I would like to know the equations for a triangle with the peak at 2/3L

I know the equations would be from

0<=x<=2/3L
2/3L<=x<=L

but I need help creating the equations.

Thanks!

Attached Images
File Type: png Untitled.png (5.9 KB)

http://ift.tt/1euQZcX

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