Question

Which set of ordered pairs does not represent a function?
Answer
Multiple Choice Answers
left curly bracket, left parenthesis, 6, comma, 5, right parenthesis, comma, left parenthesis, 3, comma, 5, right parenthesis, comma, left parenthesis, minus, 2, comma, 8, right parenthesis, comma, left parenthesis, minus, 9, comma, 4, right parenthesis, right curly bracket{(6,5),(3,5),(−2,8),(−9,4)}
left curly bracket, left parenthesis, minus, 6, comma, minus, 1, right parenthesis, comma, left parenthesis, 3, comma, 1, right parenthesis, comma, left parenthesis, 4, comma, minus, 4, right parenthesis, comma, left parenthesis, 8, comma, 1, right parenthesis, right curly bracket{(−6,−1),(3,1),(4,−4),(8,1)}
left curly bracket, left parenthesis, minus, 1, comma, 9, right parenthesis, comma, left parenthesis, minus, 8, comma, 5, right parenthesis, comma, left parenthesis, minus, 1, comma, 3, right parenthesis, comma, left parenthesis, minus, 9, comma, 1, right parenthesis, right curly bracket{(−1,9),(−8,5),(−1,3),(−9,1)}
left curly bracket, left parenthesis, 5, comma, 9, right parenthesis, comma, left parenthesis, 2, comma, minus, 5, right parenthesis, comma, left parenthesis, minus, 1, comma, minus, 5, right parenthesis, comma, left parenthesis, 0, comma, 1, right parenthesis, right curly bracket{(5,9),(2,−5),(−1,−5),(0,1)}

Answer 1

The third set: {(-1, 9), (-8, 5), (-1, 3), (-9, 1)}.
Reason: the input -1 is paired with two different outputs (9 and 3), so it is not a function.