I need to find the vertical sections and level curves of the function z=max(x,y^2) associated with the constant 1,2,3,4 so that I can sketch them. I know given z=f(x,y) then the vertical sections of the function are z=f(c,y) where c is a constant and the level curves are c=f(x,y). I've been able to sketch other problems similar to this but I don't understand the function z=max(x,y^2). Can someone help please? Thanks!