If x and y are positive integers such that (3x + 7y) is a multiple of 11, then which of the followings are divisible by 11?	Choose the correct choice:  A) 4x + 6y  B) 4x - 9y  C) 4x + 6y  D) 9x + 4y  E) 8x + 4y
By hit and trial method, we get x=5 and y=1 such that 3x + 7y = 15 + 7= 
<gadget id="calculator">15 + 7</gadget>
<output>22</output>
22 is a multiple of 11.   Then   (4x + 6y)= (4 × 5 + 6 × 1) = 26 which is not divisible by 11   (x + y + 4) = (5 + 1 + 4)= 
<gadget id="calculator">(5 + 1 + 4)</gadget>
<output>10</output>
10 which is not divisible by 11   (9x + 4y)= (9 × 5 + 4 × 1) = 49 which is not divisible by 11   (4x - 9y) = (4 × 5 - 9 × 1) = 20 - 9= 
<gadget id="calculator">20 - 9</gadget>
<output>11</output>
11 which is divisible by 11   Answer is 4x - 9y
<result>B</result>
If x and y are positive integers such that (3x + 7y) is a multiple of 11, then which of the followings are divisible by 11?