How do you work out Young's Modulus?

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Gallows
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I am really finding it hard to work out Young's Modulus.

I have my stress / strain graph

I was told I should apply a gradient on the graph to work out youngs modulus

The strain is in (m) and the stress is in (nm-2)

How do I work out the youngs modulus, and what unit of measurement would youngs modulus be in?
 
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