Find Two Functions Defined Implicitly by the Given Relation $$x ^ { 2 } + y ^ { 2 } = 81$$

question 47

Multiple Choice

Find two functions defined implicitly by the given relation.
- $$x ^ { 2 } + y ^ { 2 } = 81$$

• A) \(y = \sqrt { 81 } + x\) or \(y = \sqrt { 81 } - x\)
• B) \(y = \sqrt { 81 - x ^ { 2 } }\) or \(y = \sqrt { 81 + x ^ { 2 } }\)
• C) \(y = \sqrt { 81 } + x\) or \(y = - \sqrt { 81 } - x\)
• D) \(y = \sqrt { 81 - x ^ { 2 } }\) or \(y = - \sqrt { 81 - x ^ { 2 } }\)

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