Question

Resolver no método da substituição

b) x+y=6
2x+y=4

Answer 1

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

$x = 6 - y$

$2x + y=4$
$2.(6 - y) + y = 4$
$12 - 2y + y = 4$
$-y = 4 - 12$
$-y = -8 *(-1)$
$y = 8$

$x+y=6$
$x +8=6$
$x=6-8$
$x=-2$