Hi again,(adsbygoogle = window.adsbygoogle || []).push({});

how about the below problem, please give me advice.

Let x and y be possitive integers such that 3x+7y is divisible by 11. Which of the following must also be divisible by 11

A. 4x+6y

B. x+y=5

C. 9x+4y

D .4x-9y

E. x+y-1

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# A problem of number theory

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