Determine which of the following sets are subspaces of R 1. {[x, y, 2] | - 5x − 7y + 3z = 4} 2. {[-4x, 5x, 7xT | z arbitrary number} 3. {[x, y, z) | 1 ≥ 0 y ≥0 z≥0}. ? P 2

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