Ok, I am confused and I want to be precise about whether I am using the correct language.

Presumably it is correct to say something like,

Sketch y= x^{2 }But is it correct to saysketch y-xAre these equivalent in this context? The latter doesn't feel right? What would be the precise mathematical way of asking what does y-x^{2}=0

^{2}=0 look like?