Consider a function ƒ : R³ -> R³ 2x1 + 7x2 - 9x3 ƒ(|x₂|) = ON x1 - 5x2 + 2x3 x2 + 3x3 x1 x3 Is the above function a linear function? If so, please show mathematically, that it satisfies superposition principle. If not, please explain why it isnt.

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