I am having a hard time with this problem, and i need some help.(adsbygoogle = window.adsbygoogle || []).push({});

It says:

In Exercisies 11-17, use set theoretic or vector notation or both to describe the points that lie in the given configurations.

11.) The plane spanned by v_{1}= (2,7,0) and v_{2}= (0,2,7)

In the back of the book they have this answer

{(2s,7s+2t,7t)| sER, tER}

I know all they did was add the two vectors together, but i dont know how the got s, and t and what they represent.

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# Theoretic or vector notation

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