Question

URGENTE AJUDaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa pfrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr eu imploroooo

Answer 1

Resposta:

x=2

Explicação passo-a-passo:

$\left \{ {{2x + y = 6} \atop {x + y = 4}} \right.$

2x + y = 6 ⇒ y = 6 - 2x

agora você substitui o Y da outra equação por (6 - 2x)

x + (6 - 2x) = 4

x - 2x = 4 - 6

- x = - 2 (×-1) (vezes menos um para poder deixar a equação positiva)

x = 2