College Algebra / Unit 3 Alg 146 short lesson, about 20 seconds
The Point-Slope Formula
Captions available
The idea
The point-slope formula turns one point and a slope into a line's equation: y − y₁ = m(x − x₁).
In practice
Slope 2 through (1, 2): y − 2 = 2(x − 1), which unwraps to y = 2x, slope-intercept recovered.
Where people slip
The subtracted coordinates belong to the known point.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
Unlocks
- Nothing yet depends on this.
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