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Equation of a line from a point and the slope

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Learn it Know the slope m and one point (x₁, y₁)? Substitute them into $y = mx + b$ and solve for b.

Example: Slope 2, through (3, 1).

  1. $1 = 2(3) + b$.
  2. $1 = 6 + b$, so $b = -5$.
  3. $y = 2x - 5$.

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