Coordinate Geometry: Perpendicular Line Through a Point - Expii (2024)

To find a line that's perpendicular to a line and goes through a particular point, use the point's coordinates for (x1, y1) in point slope form: y - y1 = m (x - x1). Then, calculate the "negative reciprocal" of the old line's slope and plug it in for m.

Coordinate Geometry: Perpendicular Line Through a Point - Expii (2024)
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