Question

Which set of ordered pairs represents a function?
O{(-5, -1), (9,7).(-2,6),(-3,7)}
O{(-7,5),(-9,-4),(-3,-1),(-3,4)}
O{(5,-3), (1,2), (1,8),(4,6)}
O{(-2,9), (-2, 6), (1, -5), (-4,-8)}
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Answer 1

a function set does not contain any X-repeats, or namely that the x-coordinate on every pair is different, let's take a peek at these sets, Check the picture below.