n = <12,-3,3> and passes through the point (2,5-2)

and it needs to be in terms of f(x,y)

I don't know if this is right but this is what I did...

12(x-2) - 3(y-5) + 3(z+2) = 0

...

12x - 3y +3z = 3

...

z = 4x - y -1

so therefore, isn't z another way of saying f(x,y) ?

so then f(x,y) = 4x - y - 1?