Question

resolva o sistema a cima​

Answer 1

$\begin{cases}x + 3y = 5 \implies x = 5 - 3y\\3x - 2y = 1\end{cases}\\\\3 \cdot (5 - 3y) - 2y = 1\\15 - 9y - 2y = 1\\15 - 11y = 1\\-11y = 1 - 15\\-11y = -14\\\boldsymbol{y = \frac{14}{11}}\\\\x + 3 \cdot \frac{14}{11} = 5\\x + \frac{42}{11} = 5\\x = 5 - \frac{42}{11}\\x = \frac{55 - 42}{11}\\\boldsymbol{x = \frac{13}{11}}$