plz help..! algebra l (what are domain and range)?

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(-2,4), (3,5), (0,6), (-2,5) is that a function? i dont think it is because there are two same domains...and i heard if domain repeats, its not a function.....im confused.
what about (4,5) (3,7), (9,5) and (4,5), (9,5), (2,5)?
 
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