Woking out if a graph is will be proportional or not?

Lets take Ek=(mv^2)/2. What is how to work out kinetic energy Ek, using mass m, speed v.
How would I work out without making a graph if Ek over M is proportional or not?

And I don’t care too much about the answer just so if come across another similar question, lets take Ek=(m^2v)/2 will Ek/m be proportional? I’ll be able to work it out.

I know the basics of a Y=MX+C graph.