Determine whether an equation determines y as a functions of x

x + y = 9
x^2 + y^2 = 1
x = y^2

[AkronOhioKid]

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[yussefaboud]

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[moreliaballi]

so basically what he meant was that everytime you have an y^2, it will not be a function because y is not allowed to be squared, only the x can.

[e.m.janssen]

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[sebastianmunoz]

Nearly a decade later and this man still helping people out

[brianmclogan]

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[brianmclogan]

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[brianmclogan]

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[DPStudios]

Another video from you that explains it better than my college textbook (that sometimes doesn't even attempt to explain it). Thank you!

[TeamJacobAndPaul]

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[salimamansoura]

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[experiment]

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[theignorantgamer]

This man has literally come to the rescue for me...a week late in college classes, you're the best man

[murm]

This video helps a lot to explain whether an equation determines y as a function of x. thank you so much

[brianmclogan]

can you reprint that problem again this is what I think you are asking y^2 = sqrt(x+2)?
Is that it or what is the problem again?

[savannahjones]

Thank you so much! I could not understand why or why not y would be a function of x, but now I actually get it.

[Ashton_Loomis]

I got a 97% on my test! Thank you so much.

[matthewjames]

thanks a lot m8 the video helped me, I have my algebra test in 2 days.

[musaconteh]

Thank you for the brief understanding.. really helpful..

[brianmclogan]

no if it just y then the answer would be 8 since it is y squared we have to take the sqrt of both sides