I want to plot the equation $x^2+y^2=z$ inside a volume. However I don't want to plot the center of the graph on the origin. "inspired" by the equation of a circle I tried: $(x-2)^2+(y-2)^2$ with hope of plotting the lowest point of the graph on the point $(2,2,0)$. I then tried $x+y=z$ and $(x-2)+(y-2)=z$ but this only affected it by $4$ on the $x$ axis, because it simplifies to $x+y-4=z$. (though I don't understand why this affects the $x$ axis and not the $y$ or the $z$ axi?)
How can I translate either Of those equations?