| Form | Formula | Features |
|---|---|---|
| Slope-intercept | $y = mx + c$ | slope $m$, y-int $c$ |
| Point-slope | $y - y_1 = m(x - x_1)$ | passes $(x_1, y_1)$ |
| General | $ax + by + c = 0$ | slope $= -\frac{a}{b}$ |
| Line | Equation | Slope |
|---|---|---|
| Horizontal | $y = k$ | $m = 0$ |
| Vertical | $x = k$ | undefined |
📘 MathsKiller Textbook Series | Chapter 14
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