Equation of Lines Passing through Two Points
Point-slope form · Two-point form · Collinear points
Derive and use \( y - y_1 = m(x - x_1) \)
Derive and use the two-point form
Find a line from a graph or an intersection
Test whether three points are collinear
First developed by René Descartes
Every point is an ordered pair \( (x, y) \)
Lines and curves become equations
Used in physics, computing, engineering, astronomy
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