Решите систему уравнений {2х-3у=8, {х+у=9

[latex] \left \{ {{2x-3y=8} \atop {x+y=9}} \right. [/latex] [latex] \left \{ {{2x-3y=8} \atop {x=9-y}} \right. [/latex] [latex] \left \{ {{2(9-y)-3y=8} \atop {x=9-y}} \right. [/latex] [latex] \left \{ {{18-5y=8} \atop {x=9-y}} \right. [/latex] [latex] \left \{ {{-5y=-10} \atop {x=9-y} \right. [/latex] y=2 ; x=7.