Determine whether the relation is a function.

{(-7, -1), (-7, 2), (-1, 8), (3, 3), (10, -7)}

This is not a function since the definition of a function y=f(x) is a relation that maps each value of x to a unique value of y. Since in this example x = -7 maps to both y = -1 and y = 2, this is not a function.

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