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**find explicit function or functions corresponding from implicit ,,,**

## Homework Statement

1) 4x^2+9y^2=36

2)xy^2 + (x^2-1)y-x=0

## The Attempt at a Solution

1) y=√((36-4x^2)/9)==>6/3√(-4x^2)) = 2√(-4x^2))

and the book answer is ±2/3 √(9-x^2)

can someone tell me what's my mistake ?

2) well i could only expand then i stop

xy^2 + yx^2-y -x=0

how can i make the y in one side if i have y^2 and y in the same time ,,?

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