a. {(5,-3), (2,8), (-5,-1), (4,7), (2,1)}
b. {(5,3), (2,8), (-5,-1), (4,7), (5,7)}
c. {(-5,3), (2,8), (-5,-1), (4,7), (2,2)}
d. {(5,3), (2,8), (-5,-1), (4,7), (-2,1)}
b. {(5,3), (2,8), (-5,-1), (4,7), (5,7)}
c. {(-5,3), (2,8), (-5,-1), (4,7), (2,2)}
d. {(5,3), (2,8), (-5,-1), (4,7), (-2,1)}
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A function can only have one x-value for each y-value. D is the only choice that satisfies this condition.