The variables x and y are proportional. Use the values to find the constant of proportionality. Then write an equation that relates x and y. When y=72 , x=3.

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.