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En rett linje er gitt med parameterframstillingen  $\\begin{array}{cccc} x= & \\var{a} & + & t \\\\ y= & \\var{b} & + & (\\var{f}t) \\\\ z= & \\var{c} & + & (\\var{g}t) \\end{array}$

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Avgjør hvilke av disse punktene ligger på denne linja

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Avgjør hvilke av disse vektorene som er retningsvektorene til denne linja

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