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![](img5.gif)
Forward elimination:
![](img6.gif)
Back substitution: x=-2y. So, the null space is a line through the
origin:
![](img7.gif)
Vector form:
![](img8.gif)
so that (-2,1) is one possible basis vector for this line.
A line is a one-dimensional space, so it needs exactly one basis vector.
Next: 3D Example
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