【GRE数学】If x is an odd integer,for which of the following equ

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【GRE数学】If x is an odd integer,for which of the following equations must y be an even integer?
RT 其他选项都排除了,只剩x+2y=7 & 2x+y=6
PS.by the way,integers between 1 and 100,包括1和100这两个数吗?

2x+y=6中y是偶数.因为2x是偶数,因此y只能是偶数,而第一个式子中y不论奇数或偶数,那个式子都有成立的可能.
integers between 1 and 100,应该是包括1和100的.
再问：嗯明白了

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