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Determine if W is a subspace of R^3 under the usual addition and scalar multiplication. Either...

Determine if W is a subspace of R^3 under the usual addition and scalar multiplication. Either show algebraically that it is or show how it isn't algebraically. W= {(x1, x2, x3) ∈ R^3 x1 = x2 and x2 = 2x3 }

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