Testing for Functions RepresentedAlgebraically In Exercises 11–18,determine whether the equation represents yas a function of x.11. x2 + y2 = 4 12. x2 − y = 913. y = √16 − x2 14. y = √x + 515. y = 4 − ∣x∣ 16. ∣y∣ = 4 − x17. y = −75 18. x − 1 = 0

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section5.3: The Natural Exponential Function
Problem 1E
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Testing for Functions Represented
Algebraically In Exercises 11–18,
determine whether the equation represents y
as a function of x.
11. x2 + y2 = 4 12. x2 − y = 9
13. y = √16 − x2 14. y = √x + 5
15. y = 4 − ∣x∣ 16. ∣y∣ = 4 − x
17. y = −75 18. x − 1 = 0

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