Hi, just a quick problem involving Iso Contours and scalar fields.

Draw the isocontours of $\displaystyle \phi = 2x + y$.

I know that $\displaystyle \phi$, in 2 dimensions, defines an iso contour, and that $\displaystyle \Delta \phi = (2,1)$.

So would this just be a plane surface? If so how do I draw the contours?

Sorry if this is a little confusing, just getting to grips with it myself.