Question

Вычислите координаты точек пересечения прямых: x+3y=-12 и 4x-6y=-12.

Answer 1

$\left \{ {{x+3y=-12} \atop {4x-6y=-12}} \right. \\ +\left \{ {{2x+6y=-24} \atop {4x-6y=-12}} \right. \\ \left \{ {{6x=-36} \atop {x+3y=-12}} \right. \\ \left \{ {{x=-6} \atop {-6+3y=-12}} \right. \\ \left \{ {{x=-6} \atop {y=-2}} \right. \\ \\ OTBET:(-6;-2)$