When you blow - you're moving the air that was static over the top of the paper. This lowers the air pressure relative to the air underneath, so it pushes upwards on the piece of paper.
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Slope equals rise over run.
Rise over run
Rise over run gives you slope, not points
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.