Question

Реши систему уравнений {a=7
{2a−b=17

Answer 1

$\left \{ {{a=7} \atop {2a-b=17}} \right. \ \textless \ =\ \textgreater \ \left \{ {{a=7} \atop {2*7-b=17}} \right. \ \textless \ =\ \textgreater$
$\ \textless \ =\ \textgreater \ \left \{ {{a=7} \atop {-b= 17-14 }} \right. \ \textless \ =\ \textgreater \ \left \{ {{a=7} \atop {b=-3}} \right.$