It is known that the solution of the system of equations x + y = m 5x + 3Y = 31 about X and Y is nonnegative, and the value of integer m is obtained It's better to speak more clearly, and please use the knowledge of solving inequality in the second semester of junior high school to solve it~

X + y = M = = > x = M-Y, substitute 5x + 3Y = 31 to get 5 (M-Y) + 3Y = 31
5m-2y = 31,
The results show that y = (5m-31) / 2 > = 0, x = (31-3m) / 2 > = 0
Get 31 / 3 〉 = m > = 31 / 5

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