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stiind  ca x+2y=24 si x+y=19 determinati y


Răspuns :

 x+2y=24 si x+y=19=>x=19-y19-y+2y=24
2y-y=24-19
y=5

x=19-5
x=14
x+2y=24
x+y=19 | x2

2x+2y=38
x+2y=24
---------------- ( - )
x=14
y=19-14
y=5