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Direction Numbers and Symmetric Equations of a Line
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In this video I go over what direction numbers and symmetric equations of a line are. Direction numbers are the components of the parallel vector in a vector equation of a line. We can use any three numbers that are proportional to the direction numbers and still get the same line. This is because the vector and parametric equations of a line are not unique.
The symmetric equations involve taking out the parameter t from each of the three parametric equations and then equating them to get equations that are symmetric, as the name implies. If one of the direction numbers is 0, then the symmetric equations can be simplified by having that coordinate equal to the corresponding point on the line.
The timestamps of key parts of the video are listed below:
- Direction Numbers: 0:00
- Symmetric Equations of a Line: 3:40
- Symmetric Equations if a Direction Number is Zero: 7:00
- Example 2: 9:21
- Solution to 2(a): 9:46
- Solution to 2(b): 15:34
- Note on Example 2: 20:30
This video was taken from my earlier video listed below:
Related videos:
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The symmetric equations involve taking out the parameter t from each of the three parametric equations and then equating them to get equations that are symmetric, as the name implies. If one of the direction numbers is 0, then the symmetric equations can be simplified by having that coordinate equal to the corresponding point on the line.
The timestamps of key parts of the video are listed below:
- Direction Numbers: 0:00
- Symmetric Equations of a Line: 3:40
- Symmetric Equations if a Direction Number is Zero: 7:00
- Example 2: 9:21
- Solution to 2(a): 9:46
- Solution to 2(b): 15:34
- Note on Example 2: 20:30
This video was taken from my earlier video listed below:
Related videos:
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