.// I /.VA. 



LOi 



Let J* l m(jr l . y, > l- IB 



DM til." l.lsr. ' 



/', [nince 

 an* I /', are on opposite sides of 



iM.l mi ti,,- name side of 



'- 



(Art 



iOd 





-13 



18 







Henoe 



-1 /- 77y 4- 43 



.-. pi.it i-ii ..f the bisector (8), fur equation (.~>) asserts 

 that if (s r y,) be the coordinates of any point on this bisec- 

 tor th-y .satisfy equat 



Similarly, let P s = (A, AT) be any point on line (4), the 

 i hisector, then Q^P 9 = R^P^ [since and P % are on 

 site sides of tin- lines (1) and (2), or else both on the 

 same side of each of these lines] ; 



II 



18 



+ 17-0 





c equation of the bisector (4), for the 



