Question

$\left \{ {{2x+y=1} \atop {2x-y=4}} \right.$

Answer 1

$\left \{ {{2x + y = 1} \atop {2x - y = 4}} \right. \\\\ 4x = 5 \\ x = \frac{5}{4} \\ x = 1,25$

Resposta: 1,25