Question

1) which set of ordered pairs in the form of (x,y) does not represent a function of x?

A) {(0,2),(1,-1),(2,3),(3,-2)}
B) {(0,-2),(1,1),(2,3),(3,-2)}
C) {(0,2),(-1,-1),(2,-3),(3,2)}
D) {(0,2),(1,2),(1,-2),(3,2)}

Answer 1

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