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Finding the equation of a line - two points

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I am working on a partial differential equation for a vibrating spring, but need to a data point from my graph. How do I find the y intercept of the line in the attached picture of the second part of the graph (the line between alpha and pi?).

let k=0.01 and alpha = ((2*pi)/3)).

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The solution shows how to obtain the line equation when given two points.

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