If the solution of the system x + 2Y = M2X + y = 1 satisfies X-Y = 5, then the value of M is______ ．

According to the meaning of the title: 2x + y = 1, 1 x − y = 5, 2, 1 + 2: 3x = 6, i.e. x = 2, 1 - 2 × 2: 3Y = - 9, i.e. y = - 3, substituting x = 2, y = - 3 into x + 2Y = m, i.e. M = 2-6 = - 4, so the answer is: - 4

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