if the tens digit x and the units digit y of a positive integer n are reversed,the resulting intger is 9 more than n.What is y in terms of a 10-x b 9-x c x+9 d x-1 e x+1

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if the tens digit x and the units digit y of a positive integer n are reversed,the resulting intger is 9 more than n.What is y in terms of a 10-x b 9-x c x+9 d x-1 e x+1
if the tens digit x and the units digit y of a positive integer n are reversed,the resulting intger is 9 more than n.What is y in terms of
a 10-x b 9-x c x+9 d x-1 e x+1

if the tens digit x and the units digit y of a positive integer n are reversed,the resulting intger is 9 more than n.What is y in terms of a 10-x b 9-x c x+9 d x-1 e x+1
问题:如果把一个正整数n的十位数x和其个位数y相颠倒,得到的整数是9,请用x表示y(那个more than n 我真心没看懂.)
回答:我感觉应该选择b.9-x
如果按照题意走的话,x=9,y=0,所以x+y=9

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