Question

1/4х-у=-5
1/2х-1/7у=3
Решить систему неравенств 

Answer 1

1/4X - Y = - 5 
1/2X - 1/7Y = 3 
-------------------
1/2X = 1/7Y + 3 
1/4X = 1/14Y + 3/2 
1/4X = Y - 5 
--------------------
1/14Y + 3/2 = Y - 5 
( Y + 21 ) / 14 = ( 14Y - 70 ) / 14 
Y + 21 = 14Y - 70 
13Y = 91 
Y = 7 
-----------------------
1/4X = 7 - 5 
1/4X = 2 
X = 8 
---------------------
ОТВЕТ ( 8 ; 7 )