340 ALGEBRi. 



Or 115— i5>=20+4j, 

 Or ir^'— 115— 20=95^ 

 And y=^-s> 



Whence xZ^-^ zzd. 



I. Given \ ""-^ , > ; to find x and v. 



From the first equation A'z=:r2-—j;, 



And from the second, KZ:zh'\-^y 



Therefore a — 'yzzdo-^yy or 2)j=;a — -^^ 



^ — -I' 

 And ccnsequentlj^, ^= — — , 



And ii'zia — v=:^ 



3. Given ^ 



+t=' 



l^ 3 2 



rt-|:-^ 



> \ to find it: and "^^ 



From the iirst equation a:zzi4— ~, 



And from the second, *Yrr:24- 



3j' 



2V "V 



Therefore, 1 4 ~z=z:2 4 — -^j 



.^ 2 



And 42 — 2yzz']2' 



9y 



Or 34— 4J 11:144— 9j;; 



Whence j;;':=ii44 — 84i:::6c, 

 Andy=:^=i2, 

 2y 



4. Given 



