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E. Determine the graph of each degenerate conics
7. x²+ 20x + y2 -- 20y + 200 = 0
8. x² +43 +16y² - 128y + 292 = 0
9. 9x² + 72 x – 64y²+ 128 + 80 = 0
10. 2x² + y² - 4x + 2y + 3 = 0 ​