Решите систему уравнений:[latex] \left \{ {{x+2y=7} \atop {2x-3y=5}} \right. [/latex]

Приветствую Вас! [latex] \left \{ {{x+2y=7} \atop {2x-3y=5}} \right. [/latex] [latex] \left \{ {{x=-2y+7} \atop {2x-3y=5}} \right. [/latex] [latex] \left \{ {{x=-2y+7} \atop {2(2y+7)-3y=5}} \right. [/latex] [latex] \left \{ {{x=-2y+7} \atop {-7y+9=0}} \right. [/latex] [latex] \left \{ {{x=-2y+7} \atop {y= \frac{9}{7} }} \right. [/latex] [latex] \left \{ {{x= \frac{31}{7} }; \atop {y= \frac{9}{7} }} \right. [/latex]