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the two-point form for a line in 2d is $$y-y_1 = \left(\frac{y_2-y_1}{x_2-x_1}\right)(x-x_1);$$ what is it for 3d lines/planes?

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    For your RHS, you could add parentheses to show the $(x-x_1)$ is intended to be in the numerator. With the slash, it can be confusing. (Fixed by Arturo Magidin)2011-04-29

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