Without a calculator or computer, match the functions with their graphs in the figures below. Note that two of the functions do not have a matching graph.

(a) $z=2-x^2-y^2$ ? 1 2 3 4 none of these graphs
(b) $z=2(x^2 + y^2)$ ? 1 2 3 4 none of these graphs
(c) $z=2+x-2y$ ? 1 2 3 4 none of these graphs
(d) $z=2-x+2y$ ? 1 2 3 4 none of these graphs
(e) $z=-2$ ? 1 2 3 4 none of these graphs
(f) $z=2-x$ ? 1 2 3 4 none of these graphs

1.		2.
3.		4.