Решите систему ур-ий методом подстановки (20 баллов!!!!) у-2х=1 6х-у=7 _____ х = 2 – у, 3х – 2у = 11 _____ х + у = 6, 3х – 5у = 2.

[latex] 1) \\\left \{ {{y-2x=1} \atop {6x-y=7}} \right. \\ \left \{ {{y=1+2x} \atop {6x-(1+2x)=7}} \right. \\ \left \{ {{y=1-2x} \atop {4x=8}} \right. \\ \left \{ {{y=1-2x} \atop {x=2}} \right. \\ \left \{ {{y=5} \atop {x=2}} \right. \\ 2) \\ \left \{ {{x=2-y} \atop {3x-2y=11}} \right. \\ \left \{ {{x=2-y} \atop {3(2-y)-2y=11}} \right. \\ \left \{ {{x=2-y} \atop {y=-1}} \right. \\ \left \{ {{x=3} \atop {y=-1}} \right. [/latex] [latex]3) \\ \left \{ {{x+y=6} \atop {3x-5y=2}} \right. \\ \left \{ {{y=6-x} \atop {3x-5(6-x)=2}} \right. \\ \left \{ {{y=6-x} \atop {8x=32}} \right. \\ \left \{ {{y=6-x} \atop {x=4}} \right. \\ \left \{ {{y=2} \atop {x=4}} \right. [/latex]