Given that the equation 2x + y = 3nx + y = 1 and 2x + my = 2x + y = 1 have the same solution, then M + n=______ ．

Solve the equations: 2x + y = 3x + y = 1, the solution is: x = 2Y = - 1, according to the meaning of the question: 2n − 1 = 14 − M = 2, the solution is: M = 2n = 1, so m + n = 2 + 1 = 3

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1. If the solution of the system x + 2Y = M2X + y = 1 satisfies X-Y = 5, then the value of M is______ ．
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3. Given that the maximum value of quadratic function y = f (x) is equal to 13, and F = (- 1) = 5, find the analytic expression of F (x)
4. Given that the maximum value of quadratic function y = f (x) is equal to 13, and f (3) = f (- 1) = 5, then the analytic expression of F (x) is f (x)=______ ．
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9. The quadratic function f (x) satisfies the following conditions: (1) f (1 + x) = f (1-x); (2) the maximum value of F (x) is 15; (3) the sum of two cubes of F (x) = 0 is 32. Find f (x); if x belongs to [- 1,4], find the maximum value of F (x); find the minimum value of F (x) in the interval [M, M + 2]
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