If x and y are positive integers such that (3x + 7y ) is a multiple of 11, then which of the following will also be divided by 11?
Choose the correct choice from the following answers
A) 4x + 6y	B) x + y + 4	C) 9x + 4y	D) 4x - 9y	E) None of these
Keeping y =1, for x = 5, we have   3x + 7y =22   which is divisible by 11.   Now, substitute x =5 and y =1 in each alternative and find out   which expression becomes a multiple of 11?   Now, 4x + 6y = 4 x 5 + 6 = 26   x + y + 4 = 5 + 1 + 4= 
<gadget id="calculator">5 + 1 + 4</gadget>
<output>10</output>
10   9x + 4y= 9 x 5 + 4 = 49   4x - 9y = 4 x 5 -9 = 20 -9= 
<gadget id="calculator">20 -9</gadget>
<output>11</output>
11   which is divisible by 11   ANSWER:4x - 9y
<result>D</result>
If x and y are positive integers such that (3x + 7y ) is a multiple of 11, then which of the following will also be divided by 11?