Wallet Security – Deriving y from x

We have x and y and we know there is a way to calculate y from x, but it’s hard to find on our own. Can someone help me? Here are some examples: X = 34361880248213416881623623626262626263333333333333333134270470470470470426363564245 ~ Y 95099479783021027

X = 974711002889837586527888888888888888888888888888888888888888888888858597542 761096006

X = 94420425631834834806380638017171716383475473636363636363636360497514463 y 66850516895