Question

Решите систему уравнений:5x-9y=17 3x+7y=35

Answer 1

$\left \{ {{5x-9y=17} \atop {3x+7y=35}} \right. \Leftrightarrow \left \{ {{15x-27y=51} \atop {15x+35y=175}} \Rightarrow (35+27)y=175-51 \Leftrightarrow y = \frac{122}{61}=2$$5x-9y=17 \Rightarrow 5x = 35 \Leftrightarrow x = 7$
Значит, ответ:
$\left \{ {{x=7} \atop {y=2}} \right.$