Given the function y = (n-1) x ^ (n power + 2n + 2) + m + 3, ① when n is what, y is the first-order function of X? ② when y is the positive proportional function of X, find the value of M + n

①
N + 2n + 2 = 1, but n-1 is not equal to 0
n^2+2n+1=0
n=-1
②
N + 2n + 2 = 1, M + 3 = 0
n=-1,m=-3
m+n=-4

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