What is the Function Relationship between X and Y?

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Hello!
I have just joined this wonderful community. I do my best to learn math and other sciences on my own. Rather difficult thing to do, but I do hope to cope with this interesting task. I will be asking questions hoping to get help. :)
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Greg Bernhardt said:
Welcome to PF!
Thank you very much! Wonderful site. Great work. :)
 
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你能帮助我吗 ？
问：以下哪个表达式表示y是X的函数？
①2y + x = 3; ②y = x + 2z; ③y = 2；④y = kx + 1（k为常数。）；⑤y²= x
 

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