Question

Does the equation `x^2+y^2=121` define `y` as a function of `x`?

Answer 1

`y=sqrt(121-x^2)`

Explanation:

As `x^2+y^2=121`

`y^2=121-x^2`

or `y=sqrt(121-x^2)`

Answer 2

`y=sqrt(121-x^2)`

Explanation:

As `x^2+y^2=121`

`y^2=121-x^2`

or `y=sqrt(121-x^2)`