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Let 1/x ==a 
now 7a+4y=1 therefore a= 1-4y/7                 (i)
also 5a+2y =-1  tf  a=-1-2y/5          (ii)
from 1 and 2
therefore solving y= 2 and a=-1 
therefore x=-1 

hope dis helps u . plz mrk it the best
0 0 0
want another answer
solve it fully
ok .............any method i mean substitution or cross multiplication
ur ans.is ok but  form eq 1 and eq..2 u write clearly
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