Question

Which set of ordered pairs represents a function?

○ {(7,-2), (5,-9), (−7, −3), (7,4)}
O {(-3,-8), (-3,-4), (-7,2), (4, -1)}
○ {(5,-4), (-6, 6), (6, –4), (3, −6)}
○ {(−4, 7), (–9, 9), (7, −1), (7, −4)}

Answer 1

The third one: {(5,-4), (-6,6), (6,-4), (3,-6)} because each input has only one output (or putting it more simply, you could say “it’s a function because all the x’s have one y” in your head to figure it out!)