This might be easy for u but not for me pls help

It’s 3! it’s not the confusing once you understand it so i’ll try and help. The constant rate of proportionality is basically it’s constant rate of change. So you look at the graph and see what y equals when x is one. If you can’t than keep going until you see for example that 2 x is at 6 y than you would divide 6 by 2 and get 3. Hope that helps!