Решите способом подстановки {2x+5y=28 5x+y=1

[latex] \left \{ {{2x+5y=28} \atop {5x+y=1}} \right. \\ \\ \left \{ {{2x+5\cdot(1-5x)=28} \atop {y=1-5x}} \right. \\ \\ \left \{ {{2x+5-25x=28} \atop {y=1-5x}} \right. \\ \\ \left \{ {{-23x=23} \atop {y=1-5x}} \right. \\ \\ \left \{ {{x+-1} \atop {y=1-5\cdot(-1)}} \right. \\ \\ \left \{ {{x=-1} \atop {y=6}} \right. [/latex]