Asked by Lid

determine whether x=[2,3,4]+t1[1,1,1]+t2[1,2,3] is a subspace of R3

I honestly don't even know where to start. Please, help
Answered by Damon
Maybe start here: Look at the end, how to prove addition and multiplication by a constant remain in R3
http://www.math.jhu.edu/~nitu/subspace.pdf
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