. Let L ⊂ R3 be the following subspace: L = {(x1, x2, x3) : x1 + x2 + 3x3 = 0}, and let ℓ be the linear functional given by ℓ(x1, x2, x3) = x1 − x2 + x3. Find the norm of the restriction of ℓ to L.

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A: here we can use linear combination to prove that given set is linearly independent.

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