4x²-9y²=36
-9y²=36-4x²
y²=36-4x²/-9
y=√4(9-x²)/-9
y= 2√9-x²/√-9
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4x²-9y²=36
-9y²=36-4x²
y²=36-4x²/-9
y=√4(9-x²)/-9
y= 2√9-x²/√-9