1038 CHAPTER 10 Analytic Geometry 13. Write the equation of a hyperbola with y-intercepts 10, -52 and 10, 52 and foci at 10, -62 and 10, 62. Without actually graphing, identify the type of graph that each equation has. 14. x2 + 8x + y2 - 4y + 2 = 0 15. 5x2 + 10x - 2y2 - 12y - 23 = 0 16. 3x2 + 10y2 - 30 = 0 17. x2 - 4y = 0 18. 1x + 922 + 1y - 322 = 0 19. x2 + 4x + y2 - 6y + 30 = 0 20. The screen shown here gives the graph of x2 25 - y2 49 = 1 as generated by a graphing calculator. What two functions y1 and y2 were used to obtain the graph? −7.52 −6.2 6.2 7.52
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