Pick any two points. If possible, find ones that coincide with grid points. Label then A and B. It does not matter which way round you label them but the rest of this depends on them being treated in the same order.
Calculate the rise: the vertical distance from A to B, as measured on the vertical axis.
Calculate the run: the horizontal distance from A to B, as measured on thehorizontalaxis.
Divide the rise by the run.
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Rise over run
Rise over run gives you slope, not points
Slope equals rise over run.
It could have been either but it must have been easier to put the y-coordinate on top.
The measure of the steepness of line expressed as rise over run is called slope.