Question

1).
a - 2b = -4
2a + b =
+ b = 7​

Answer 1

Respuesta:

©27©

Explicación paso a paso:

a-2b=-4®®®®®®b=7®®®®®®®®a-2b=-4®®®2a+b

a+4=2b®®®®®®a+4/2=7®®®®10+4=2b®®®2(10)+7

a+4/2=b®®®®®a+4=14®®®®®®14=2b®®®®20+7

®®®®®®®®®®®®a=10®®®®®®®®7=b®®®®®®~27~