Ta có: \(a+b=-1\)
\(2a+b=-4\)
\(\Rightarrow\left(2a+b\right)-\left(a+b\right)=-4+1\)
\(\Rightarrow a=-3\)
\(\Rightarrow b=-1+3=2\)
Vậy a = -3, b = 2
a, 2a + b = -4
=> a + a + b = -4
=> a - 1 = -4
=> a = -4 + 1
=> a = -3
=> b = -4 - 2a
=> b = -4 - 2. (-1)
=> b = -4 + 2
=> b = -2
Vậy a = -3, b = -2
2a+b=-4
a+a+b=-4
a+(a+b)=-4
a-1=-4
a=-4+1
a=-3
thay a=-3vao bt
a+b=-4
-3+b=-4
b=-4+3
b=-1
vay a=-3;b=-1