Решите систему линейных уравнений у=7х-15 у+1=-6х+12

[latex] \left \{ {{y=7x-15} \atop {y+1=-6x+12}} \right. \\ \left \{ {{y=7x-15} \atop {7x-15+1=-6x+12}} \right. \\ \left \{ {{y=7x-15} \atop {13x=26}} \right. \\ \left \{ {{x=2} \atop {y=7*2-15}} \right. \\ \left \{ {{y=-1} \atop {x=2}} \right. \\ OTBET: (2;-1)[/latex]