The graphs below show level sets for six different functions, where the red areas represent the the lowest heights and the purple areas are the highest heights.

A		B		C
D		E		F

Match the following functions with the proper graphs above.

	1.	$f(x,y) = x^2 + 3y^2$
	2.	$f(x,y) = 4 - 3x^2 - y^2$
	3.	$f(x,y) = y^2 - 3x$
	4.	$f(x,y) = x^2 - 3y$