Question

9. Resolva os sistemas a seguir:
a) x/y=6/11
x+3y=117
​

Answer 1

$\begin{cases}\dfrac{x}{y} =\dfrac{6}{11}\\x+3y=117\end{cases}$

$+\underline{\begin{cases}11x-6y =0\\2x+6y=234\end{cases}}$

$13x=234\\x=\dfrac{234}{13}\\x=18$

$y=\dfrac{117-x}{3}=\dfrac{117-18}{3}=33$