Question

Is x=y^2-3 a function ?

Answer 1

It's not a function : see the explanation below.

Explanation:

`x=y^2-3`
`x+3=y²`
`y=sqrt(x+3)`, or `y=-sqrt(x+3)`
So no, it's not a function ( actually it can be two functions ! )
\0/ here's our answer !