W = {x1} {x2} { x3} x1-x2 = 0 2x1-3x3 = 4 I have to determine if each set is a subspace of R3 or not. It's supposed to look like a matrix $\displaystyle \begin{bmatrix}x1 \\ x2 \\ x3 \end{bmatrix} $
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I'm thinking the answer is no because the set does not contain (0; 0; 0).
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