1) which set of ordered pairs in the form of (x, y) does not represent a function of x?
a) {(0,,-,,-2)}
b) {(0,-,,,-2)}
c) {(0,,-,-,2)}
d) {(0,,,-,2)}

Basically, x never reats with a different y
(x,y)

A is a fn of x since x never repeats
B is a fn of x since x never repeats
C is a fn of x since x never repeats
D is not since we have (1,2) and (1,-2) so this is the answer

answer is D