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In Exercises 13-15, find two different sets of parametric equations for the given rec- tangular equation. (There are many correct answers.) 13. y = x- + 10 14. x + y = 4 15. x2 + 4v2 - 16 = 0 16. Convert the polar coordinate ( - 14, 5 TT 3 to rectangular form. 17. Convert the rectangular coordinate (2. -2) to polar form and find two additional polar representations of this point. (There are many correct answers.) 18. Convert the rectangular equation x2 + y' - 12y = 0 to polar form. 19. Convert the polar equation / = 2 sin 0 to rectangular form