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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Hello everyone, I'm Cosmo. I'm an 18 years old student majoring in physics. I found this forum cause I was searching on Google if it's common for physics student to feel like they're in the wrong major in the first semester cause it feels like too much for me to learn the materials even the ones that are considered as "basic math" or "basic physics", I've initial fascination with the universe's mysteries and it disconnect with the reality of intense, foundational mathematics courses required...
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