i N - WT 



5. |f + 4=0. 0. r + 3y = 20; 31 x - 27 y = 200. 



7. 13x* + 13y- I30x-78y + 321 = 0. 8. 1 + 1 = 1. 



o f-r a+6 



r" 2 



10. (x,, yi)~=(2, 0), or =(ff - 4). 



Page 151. Art. 87. 



1. 28|; -26|; lltf; - 4^. 2. :JJ, L'i, :,, 4. 



3. V V^4. ^ ^7, 6, - v/7. 4. i' , - f J r = 61 ; 



Pages 155, 156. Art. 90. 



1. (a) 2V86; (/3) 2V34. 



2. (.x + 2 



(7) (7 

 3. x = 0, 2l3r + 20y = 0; y - 2 = 



. 



> 



4 10x-14y = 63. 5. (6,8). 6. 3x + 7 y = 26 ; 3* + 2y = 26. 



Page 158. Art. 93. 



1. 3x + 4y = 7. 2. 3x-y=14. 3. (20, 30); (36 a, 



4. 4x + 7y = C5;7x-4y = 66, 4x + 7y = 66. 

 7. Pole is at infinity, in the direction = tan' 1 ( }). 



Page 162. Art. 97. 

 2. 



3. x-y = 0; JV2(a + 6)*- 10 c. 4. (~2, -1). 



7. y = 3;6x = y + 7;4x + y+l=0. 



Page 164. Art. 100. 



2. p-30p8intf+126 = 0; sin*0= J. 3. p 2 - 12psin + 27 = 0; 

 4. x + xy + y-7x-8y = 0. 5. S* + y* - xy = 4. 



6. x f +xy+y-ax-a|f=0. 7. 

 8. ta 



