Symmetric Equation of a Line ((x-x1)/a = (y-y1)/b = (z-z1)/c)
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(x-x1)/a = (y-y1)/b = (z-z1)/c
What each symbol means
| Symbol | What it stands for |
|---|---|
| a:b:c | Direction ratios |
| (x1,y1,z1) | Point on line |
When to use this
If any DR is 0, write separate equations (e.g. x=x1, (y-y1)/b=(z-z1)/c).