Question

x+y=9 e x/2y =1

Porfavor me ajudem com essa questao

Answer 1

Resposta:

X = 6

Y = 3

se você mudar as incógnitas na equação :

X + Y = 9

6 + 3 = 9

e na outra:

X/2y = 1

6 ÷ 2 × 3 = 1

6 ÷ 6 = 1

Answer 2

$\boxed{\begin{array}{l}\begin{cases}\sf x+y=9\\\sf\dfrac{x}{2y}=1\end{cases}\\\\\begin{cases}\sf x+y=9\\\sf x=2y\end{cases}\\\sf x+y=9\\\sf 2y+y=9\\\sf 3y=9\\\sf y=\dfrac{9}{3}\\\\\sf y=3\\\sf x+y=9\\\sf x+3=9\\\sf x=9-3\\\sf x=6\\\sf S=\{6,3\}\end{array}}$