Question: Determine whether the equation represents y as a function of x? 1. x2 + y2 = 4 2. x2 y = 9 3. y

Determine whether the equation represents y as a function of x?
1. x2 + y2 = 4
2. x2 − y = 9
3. y = (16 − x2
4. y = (x + 5

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