Question

Which set of ordered pairs represents a function?
Answer
Multiple Choice Answers
left curly bracket, left parenthesis, minus, 3, comma, 8, right parenthesis, comma, left parenthesis, minus, 6, comma, minus, 1, right parenthesis, comma, left parenthesis, minus, 6, comma, minus, 9, right parenthesis, comma, left parenthesis, 0, comma, 1, right parenthesis, right curly bracket{(−3,8),(−6,−1),(−6,−9),(0,1)}
left curly bracket, left parenthesis, minus, 9, comma, minus, 8, right parenthesis, comma, left parenthesis, 4, comma, 1, right parenthesis, comma, left parenthesis, 4, comma, minus, 4, right parenthesis, comma, left parenthesis, 0, comma, minus, 6, right parenthesis, right curly bracket{(−9,−8),(4,1),(4,−4),(0,−6)}
left curly bracket, left parenthesis, 1, comma, 2, right parenthesis, comma, left parenthesis, minus, 4, comma, minus, 2, right parenthesis, comma, left parenthesis, 0, comma, 3, right parenthesis, comma, left parenthesis, 0, comma, minus, 8, right parenthesis, right curly bracket{(1,2),(−4,−2),(0,3),(0,−8)}
left curly bracket, left parenthesis, 2, comma, minus, 5, right parenthesis, comma, left parenthesis, 6, comma, minus, 5, right parenthesis, comma, left parenthesis, minus, 1, comma, 7, right parenthesis, comma, left parenthesis, 7, comma, minus, 1, right parenthesis, right curly bracket{(2,−5),(6,−5),(−1,7),(7,−1)}

Answer 1

{(2,−5),(6,−5),(−1,7),(7,−1)}

Reason: each x-value (2, 6, −1, 7) appears only once, so every input has exactly one output.