Each has 3 segments right? Top middle and bottom
So the answer has to have a 3
So zero in on that...
Then each pattern adds the same # each time to each segment so the # of each segment will also always be the same.
So now the info you have is always 3 and always the same number.
So the only answer that is always 3 and a number is...
Y=3 Times the number in the line segment
So y=3x