I've looked everywhere and even the textbook does not explain how to do this. This is probably very simple, yet I can't figure it out.

How do you derive the expression at the bottom for the periods? Is there a specific equation?
I've looked everywhere and even the textbook does not explain how to do this. This is probably very simple, yet I can't figure it out.

How do you derive the expression at the bottom for the periods? Is there a specific equation?
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$$ m = \frac{ y_{2} -y_{1}}{x_{2}-x_{1}} $$
$$y-y_{1}=m(x-x_{1})$$
Thanks to @ganeshie8.