In Exercises 11-26, determine whether each equation defines y as a function of x. 11. x + y = 16 13. х2 + у %3 16 12. x + y = 25 14. x + y = 25 16. x? + y? = 25 18. 4x = y? 15. x? + y? = 16 17. x = y? 19. y = Vx + 4 21. x + y3 = 8 20. y = -Vx + 4 22. x + y3 = 27 24. xy – 5y = 1 26. |x| - у 3D5 23. xy + 2y = 1 25. |x| - y = 2

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