Question

Решите систему уравнения {х+2у=5 {-2х+7у=-2

Answer 1

$\left \{ {{x+2y=5} \atop {-2x+7y=-2}} \right.$
$\left \{ {{2x+4y=10} \atop {-2x+7y=-2}} \right.$
$\left \{ {{11y=8} \atop {x=5-2y}} \right.$
$\left \{ {{y= \frac{8}{11} } \atop {x= \frac{39}{11} }} \right.$