Question

X+2y=11 -x+5y= -3 ????

Answer 1

Resposta:

$S=\{(\frac{61}{7},\,\frac{8}{7})\}$

Explicação passo-a-passo:

$\begin{cases}</p><p> x + 2y =\ 11 \\</p><p> - x + 5y =\ - 3</p><p>\end{cases} \\ \\ x - x + 2y + 5y = 11 - 3 \\ 2y + 5y = 11 - 3 \\ 7y = 8 \\ y = \frac{8}{7}$

$x + 2y = 11 \\ x + 2. \frac{8}{7} = 11 \\ x + \frac{16}{7} = 11 \\ x = 11 - \frac{16}{7} \\ x= \frac{77 - 16}{7} \\ x = \frac{61}{7}$