Question

Calcule X+y=15
X-y=3

Answer 1

Ok , vamos lá !!

❒ Resolução :

Valor de X

$\begin{gathered}+\underline{\begin{cases}\sf x+y=15\\\sf x-y = 3\end{cases}}\end{gathered}$

$\sf 2x = 18$

$\sf x = \dfrac{18}{2}$

$\red{\sf x = 9}$

Valor de Y

$\sf x + y = 15$

$\sf 9 + y = 15$

$\sf y = 15 - 9$

$\red{\sf y = 6}$

Bons estudos .