<span>{х-8у-17=0</span>
<span>{<span>3х+4у-23=0 |*2</span></span>
<span><span>{х-8у-17=0</span></span>
<span><span>{6x+8y-46=0</span></span>
<span><span>Складываем два уравнения</span></span>
<span><span>7х-63=0</span></span>
<span><span>7х=63</span></span>
<span><span>х=9</span></span>
8у=46-6х
8у=-8
у=-1
Ответ:(9;-1)