Posted by Piggy on Monday, January 21, 2013 at 12:56am.
Which of the following is a function?
A) x^2 + 2y^2  4 = 36
B) {(6, 5), (1, 5), (4, 5)}
C) {(5, 4), (5, 3), (3, 6)}
D) x = y^2  3

Algebra II  Reiny, Monday, January 21, 2013 at 9:20am
apply the definition of a function to each and see if it fits.
e.g. in C > (5,4) and (5(3)
two different values of y for the same x value, not a function