Question: please help me using linear equation methods 3. Prove that the subset P = {(x, y, z) : x + 2y + 3z =0} is

please help me using linear equation methods

please help me using linear equation methods 3. Prove that the subset

3. Prove that the subset P = {(x, y, z) : x + 2y + 3z =0} is a subspace of R3

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