Solve to find x and y in the diagram. x = 15, x = 8
x = 15, y = 3
x = 15, y = 6
x = 3, y = 15

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.