Question 388211
Direct variation equation is y=kx

Your k is your variation or you could look at it as your slope. 

y=kx  Plug in what you know
4=k12 Divide both sides by 12 to cancel out your 12 that is being multiplied by k.
4(/12)=k12(/12) Simplify
1/3=k
y=1/3x This is your direct variation equation.