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b) 4x-3y=54 si x-y=12 ; c) x+y =16 si x>12​

Răspuns :

b) 4x-3y=54
x-y=12 => x=12+y
=> 4(12+y)-3y=54
48+4y-3y=54
48+y=54
y=6
c) x+y=16 => x=16-y
x>12 => 16-y>12 => -y>-4 => y<4