Question

X + y = 12; x - y = 6​

Answer 1

Respuesta:

x = 9

y = 3

Explicación paso a paso:

$\left \{ {{x+y=12} \atop {x-y=6}} \right. \\\\2x = 18\\x = 9$

$\left \{ {{9+y=12} \atop {9-y=6}} \right.$

y = 3