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You use the well-known point-point formula . Here is it: suppose P1 = (x1,y1)

and P2 = (x2,y2) An equation for the line containing P1 and P2 is

y - y1 = [(y1-y2)/(x1-x2)] (x -x1)

Note that the quantity in brackets is the slope of the line. Note also that it does not matter which point is P1 and which is P2.

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Q: How do you find the equation of a line when given two different points?
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