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The slope of a straight line is calculated as:

slope = (y2 - y1)/(x2 - x1)

= -1(y1 - y2)/-1(x1 - x2)

= -1/-1 x (y1 - y2)/(x1 - x2)

= 1 x (y1 - y2)/(x1 - x2)

= (y1 - y2)/(x1 - x2)

So it doesn't matter which way round you label the points: all that matters is that whichever point's y-coordinate you subtract from the other point's y-coordinate, you also subtract its x-coordinate from the other point's x-coordinate.

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10y ago

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