{4х+9у-9=0 {5х-6у-17=0

{4х+9у=9|×2///////{8х+18у=18 {5х-6у=17|×(3)//{15х-18у=51    {23х=69/////{х=3 {12+9у=9////{9у=-3/////{у=-(1÷3)