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Exercises 21.2, page 577

1. $x + 2 y - 2 = 0$
3. $2, (0, \frac{5}{2})$
5. $4 x - y + 20 = 0$
7. $7 x - 2 y - 24 = 0$
9. $x - y + 19 = 0$
11. $y = - 2.7$
13. $x = - 3$
15. $x - 3 y - 7 = 0$
17. $x + y - 7 = 0$
19. $3 x + y - 18 = 0$
21. $y = 4 x - 8; m = 4$

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