Experts/ace and people that wanna 4 sure only!

Hi There if im wrong but it could be 4 because i remember it you would have to go down 4 points and left 2, which it would be 4/2 = 2/1 = 2. Take my answer with a grain of it, but I think it would be y = 2x + 4. There doesn't seem to be a graph with squares, so I can't be absolutely certain. 

Hope it helps!