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For ex. f(x)=y="function"

But how do I make a a function for y? ex. f(y)=x="function"

I jus spent an hour reading the manual and TI-89Titanium for dummies. I can't find an answer.

If I convert the x function into a y function it won't be sufficient

because for a function like x=y^2

it would be y= ("under root")2

This would graph only half the function.

Please help me

Thank you,