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Practice and Applications

11. $4 x - y - 11 = 0$
13. $2 x + 3 y + 3 = 0$
15. $x^{2} - 6 x + y^{2} - 1 = 0$
17. $y^{2} = - 12 x$
19. $9 x^{2} + 25 y^{2} = 900$
21. $144 y^{2} - 169 x^{2} = 24,336$
23. $(- 3, 0), r = 4$
25. $(0, - 5), y = 5$
27. $V (0, 1$

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