Question

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

A. {(1, 1.5), (2,1.5), (3, 1.5), (4, 1,5)}
B. {(0, 1.5), (3, 2.5), (1, 3.3), (1, 4.5)}
C. {(1, 1.5), (-1, 1.5), (2, 2.5), (-2, 2.5)}
D. {(1, 1.5), (-1, -1.5), (2, 2.5), (-2, 2,5)}

thank you!

Answer 1

the one where a value of x is used more than once.