Question

Which set of ordered pairs does NOT represent a function?

{ (1, -2), (3, -4), (5, -6), (7, -8) }

{ (2.3, 4.9), (3.5, 8.2), (4.7, 4.9), (5.9, 6.5) }

{ (6, 13), (4, 16), (2, 19), (0, 0) }

{ (-41, -8), (-31, -9), (-21, -16), (-11, -23) }

Answer 1

@Night-Watcher

Answer 2

...?