Ononot — Let W be the subspace of \mathbb{R}^4 consisting of vectors

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Vectors & Spaceshard

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Let $W$ be the subspace of $\mathbb{R}^4$ consisting of vectors such that $x_1 + x_2 = 0$ and $x_3 + x_4 = 0$ . What is $\dim(W)$ ?