11.9. A (2; 3) B ( 4; 1), Oy C. C.
11.10. , Ox p/3 Oy (0; 6).
11.11. , M (4; 2) , .
11.12. , , , , 7 
.
11.13. A ABC A (1; 2), B (5; 4) C ( 2; 0).
11.14. ,
A (3; 4), , .
11.15. , 2 x 5 y + 10 = 0.
11.16. ,
A (2; 1) .
11.17. , x 2 y + 3 = 0 2 x + y + 5 = 0 .
11.18. x + y 6 = 0
2 x + y 13 = 0 , .
11
11.1. x + y 1 = 0. 11.2. x + 3 y 5 = 0. 11.3. x y + 1 = 0.
11.4. ) r = 3/ 
; ) x + 2 y 3 = 0; ) 2 x + y 4 = 0; ) x + 2 y 5 = 0; ) 1/4.
11.5. x 2 = 0. 11.6. x + 1 = 0. 11.7. x 1 = 0.
11.8. ) r = 0; ) x y 1 = 0; ) x + y + 1 = 0; ) y + 1 = 0; ) 1/2.
11.9. (0; 5/3). 11.10. y = 
x 6. 11.11. x + 2 y 8 = 0.
11.12. x + y 7 = 0. 11.13. 5 x + y 3 = 0. 11.14. 3 x 4 y 25 = 0.
11.15. 5. 11.16. x + y 1 = 0. 11.17. 5 x + 13 = 0. 11.18. x + y 6 = 0.
12.
: ; ; ; ; .
| 1. | 12.1, 12.2 | 12.5 - 12.7 | 12.11 - 12.12 |
| 2. | 12.3, 12.4 | 12.8 - 12.10 | 12.13 - 12.15 |
12.1 12.2 L 1 L 2. :
1) r , ;
2) cosj (j - ) .
12.1. L 1: 2 x + y 1 = 0, L 2: 2 y + 1 = 0. 12.2. L 1: 
, L 2: 
.
12.3. ABC :
A (1, 2), B (2, 2), C (6, 1). :
) AB;
) CD hc;
) j CD BM.
12.4. M (1, 1)
L: x = 1 + 2 t, y = 2 + t.
