let s={(2,1), (3,2), (-1,4), (1,2)} is s a relation or a function?
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let s={(2,1), (3,2), (-1,4), (1,2)} is s a relation or a function?

s is a function,

because all elements of the set s are coordinate points that satisfy the function

y - 1 = abs(x - 2)

by Level 11 User (80.8k points)

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