@MARS_999: uhhh... no. Let's clarify something: when you have (x, y) = P, x and y are not points. Together, they make up a single point, P. You need both of them to have one point.
2 points make up a line (in 2D our case, this requires 4 values). Once you have a line, you can find the slope (no additional points required).
If you do not have two points, you do not have a line. If you are missing one of the coordinate values, it is not a point (i.e. (x, ?) is not a point). You need two values to have a point, and you need two points (four values) to have a line, and you need a line to have a slope.
Calculate Slope with only three points?
Your definition of "point" is off. A point in a 2d plane consists of two coordinates. Two such points define a line.
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