Răspuns :
x + y = - 2
x - y = 4
le adunam
2x / = 2
x = 2 : 2
x = 1
y = - 2 - x
y = - 2 - 1
y = - 3
x - y = 4
le adunam
2x / = 2
x = 2 : 2
x = 1
y = - 2 - x
y = - 2 - 1
y = - 3
x+y+2=0
x-y-4=0=>x+y=-2
x-y=4
adunam sistemele
2x=2
x=2/2 =>x=1
=> x=1 ,1+y+2=0
y+3=0
y=-3
x-y-4=0=>x+y=-2
x-y=4
adunam sistemele
2x=2
x=2/2 =>x=1
=> x=1 ,1+y+2=0
y+3=0
y=-3