[計量] 請教一題
If x is an odd integer, for which of the following equations
must y be an even integer?
(a) xy=5
(b) x+y=8
(c) x+2y=7
(d) 2(x+y)=7
(e) 2x+y=6
我用X=3代入得(c),答案是(e)
可以幫忙解答嗎?
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