If the function y = (m-2) x3-m2 + m is a linear function, then the value of M is___ ．

If the function y = (m-2) x3-m2 + m is a linear function, then 3-m2 = 1, M = ± 2, ∵ (m-2) ≠ 0, ∵ m ≠ 2, then the value of M is - 2

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