Question

Rewrite R=X^2 + Y^2 for Y

Answer 1

`image`

That, assuming all the variables are non-negative numbers.

Otherwise, there's one more soultion:

`Y=-√(R-X^2)`

Answer 2

`R = X^(2) + Y^(2)`

`Y^(2) = R - X^(2)`

`Y = \sqrt{R - X^(2) }`