Question

数学解答题（写过程）

已知方程组x＋2y＝3m x-y＝9m，得解满足5x＋8y＝38，求m的值

Answer 1

根据x-y=9m,得x=9m+y,带入x+2y=3m,得9m+y+2y=3m,得出y=-2m
将y=-2m带入x=9m+y,得到x=7m,
将x=7m,y=-2m带入5x+8y=38,
得35m-16m=38,
19m=38,得出m=2

Answer 2

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