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Which of the following relations is a function?

{(-2,0),(-1,0),(0,1),(1,0)}
{(0,-2),(-1,1),(1,-1),(0,1)}
{(-1,-1),(-1,0),(-1,1),(0,-2)}

User Laure D
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-2,0, -1,0, 0,1 , 1,0
User Rich Hopkins
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