Finding an Equation of a Line Given Two Points
When two points on a line are known but the slope is not given directly, the equation of the line can be found using this four-step procedure:
- Find the slope using the two given points.
- Choose one of the two points to use as .
- Substitute the slope and the chosen point's coordinates into the point-slope form: .
- Simplify and rewrite the equation in slope-intercept form .
Either point may be used in Step 2 — both will yield the same final equation. The extra initial step of computing the slope from the two points is the only difference from the slope-and-a-point method.
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