Determine if Set of Points is a Function

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Which set of ordered pairs does not represent a function?
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left curly bracket, left bracket, 6, comma, 7, right bracket, comma, left bracket, minus, 4, comma, minus, 5, right bracket, comma, left bracket, minus, 1, comma, 7, right bracket, comma, left bracket, minus, 9, comma, minus, 7, right bracket, right curly bracket{(6,7),(−4,−5),(−1,7),(−9,−7)}
left curly bracket, left bracket, minus, 6, comma, 1, right bracket, comma, left bracket, minus, 9, comma, minus, 6, right bracket, comma, left bracket, 6, comma, 7, right bracket, comma, left bracket, 1, comma, minus, 8, right bracket, right curly bracket{(−6,1),(−9,−6),(6,7),(1,−8)}
left curly bracket, left bracket, 5, comma, 9, right bracket, comma, left bracket, 7, comma, 2, right bracket, comma, left bracket, 1, comma, 6, right bracket, comma, left bracket, minus, 6, comma, 9, right bracket, right curly bracket{(5,9),(7,2),(1,6),(−6,9)}
left curly bracket, left bracket, minus, 1, comma, 1, right bracket, comma, left bracket, 4, comma, minus, 6, right bracket, comma, left bracket, minus, 3, comma, 0, right bracket, comma, left bracket, minus, 3, comma, 8, right bracket, right curly bracket{(−1,1),(4,−6),(−3,0),(−3,8)}

Answer 1

The set of ordered pairs that does not represent a function is:

left curly bracket, left bracket, minus, 1, comma, 1, right bracket, comma, left bracket, 4, comma, minus, 6, right bracket, comma, left bracket, minus, 3, comma, 0, right bracket, comma, left bracket, minus, 3, comma, 8, right curly bracket{(−1,1),(4,−6),(−3,0),(−3,8)}

Explanation: The last ordered pair in the set {(−3,0),(−3,8)} has the same first element but different second elements. In a function, each input can only correspond to one output, so this set does not represent a function.

Answer 2

so what's the answer

Answer 3

The set of ordered pairs that does not represent a function is:

left curly bracket, left bracket, minus, 1, comma, 1, right bracket, comma, left bracket, 4, comma, minus, 6, right bracket, comma, left bracket, minus, 3, comma, 0, right bracket, comma, left bracket, minus, 3, comma, 8, right curly bracket{(−1,1),(4,−6),(−3,0),(−3,8)}