Question: The last step involved writing A in RREF, which simplifies the computation of the nullspace vectors, as it always leads to the pivot variables being

The last step involved writing A in RREF, which simplifies the computation of the nullspace vectors, as it always leads to the pivot variables being written in terms of the free variables. Note that since the third and fourth column do not contain any pivots, then they are free columns, which means that the variables x3 and x4 are free

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