A point lies on a line when its coordinates make the line equation true. Substituting x0 and y0 into Ax+By+C gives zero only when the point is exactly on the line.
⚠Small decimal rounding can affect near-zero results. This checker treats very tiny values as zero.
How Point-on-Line Testing Works
The line equation describes every point on that line. If a coordinate pair satisfies the equation, it belongs to the line.
Line Equation
Use Ax+By+C=0.
Substitution
Plug in the point coordinates.
Zero Test
Zero means the point is on the line.
Nonzero Value
Any nonzero result means off the line.
💡 Example: For line 2x+3y-12=0 and point (3,2), value=0, so the point is on the line.
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