Is there a simple test to know if a point is above or below a line in 2 dimensional vector domain?
2026-05-05 15:45:39.1777995939
Detecting whether a point is above or below a slope
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If the line equation is $y=ax+b$ and the coordinates of a point is $(x_0,y_0)$ then compare $y_0$ and $ax_0+b$, for example if $y_0>ax_0+b$ then the point is above the line, etc.