Question 637127
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Hi,
2/x + 1/y = 0
 5/x + 2/y = -5 
'u' = 1/x and 'v' = 1/y ****

2u + v = 0   |multiplying thru by -2 to  eliminate the v variable
5u + 2v = -5 
  u = -5   and v = 10 
 x = 1/-5   and v = 1/10
and...
 {{{2/(-1/5) + 1/(1/10) =-10 + 10 = 0 }}}