Question

Решите систему уравнений .
3x-y=7
2x+3y=1

Answer 1

$\left \{ {{3x-y=7} \atop {2x+3y=1}} \right. \left \{ {{y=3x-7} \atop {2x+3(3x-7)=1}} \right. \left \{ {{y=3x-7} \atop {2x+9x-21=1}} \right. \left \{ {{y=3x-7} \atop {11x=22}} \right. \left \{ {{y=3x-7} \atop {x=2}} \right. \left \{ {{y=3*2-7} \atop {x=2}} \right.$$\left \{ {{y=-1} \atop {x=2}} \right.$
                  (2; -1)