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As we know stress divided by strain is Young's modulus. Stress on y axis,strain on X axis

Use the initial straight line part of the graph and find its gradient so that stress/strain is calculated.

Select any two points on graph

Draw lines from those points onto x-axis and y-axis

Find difference between stress on y-axis points. Then find the difference between strain on x-axis points. 

Now apply formula: E= (Change in stress)/(change in strain)

Young's Modulus can be found by 

E=Tensile stress/Tensile Strain

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