Question

$x + y = 9 \\ x - y = 3$
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Answer 1

Resposta:

x + y = 9

x - y = 3

2x = 12

x = 6

6 + y = 9

y = 3

Explicação passo-a-passo:

Answer 2

Bom Dia !!!

$x +y = 9\\x - y = 3\\\\Para\ acharmos\ o\ valor\ de\ uma\ das\ incognitas,\\ devemos\ passar\ a\ outra\ junto\ com\ o\ numero\\\\x + y = 9\\\\x = 9 - y\\\\o "x"sera\ 9 - y\\\\9 - y - y = 3\\\\-2y = -6\\\\y = \frac{6}{2} \\\\{\boxed{\boxed{\boxed{\s y = 3 }}}$

$\\x + 3 = 9\\\\x = 9 - 3\\\\{\boxed{\boxed{\boxed{\sf x = 6 }}}$

Espero ter ajudado :-)

Att: LDC