Parabola: tangency of line y = mx + c (Line y = mx + c touches y² = 4ax iff c = a/m)
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Line y = mx + c touches y² = 4ax iff c = a/m
What each symbol means
| Symbol | What it stands for |
|---|---|
| c | Intercept |
| m | Slope |
When to use this
m ≠ 0; standard parabola y² = 4ax.