<span><span>{<span><span>x+5y=12</span><span>x−2y=5</span></span></span><span>{<span><span>x+5y=12</span><span>x−2y=5</span></span></span></span>Вычитаем уравнения:<span><span><span>−<span>{<span><span>x+5y=12</span><span>x−2y=5</span></span></span></span><span>−<span>{<span><span>x+5y=12</span><span>x−2y=5</span></span></span></span></span><span><span>(x+5y)−(x−2y)=12−5</span><span>(x+5y)−(x−2y)=12−5</span></span></span><span><span>7y=7</span><span>7y=7</span></span><span><span>y=1</span><span>y=1</span></span>Подставиим найденную переменную в первое уравнение:<span><span>x+5(1)=12</span><span>x+5(1)=12</span></span><span><span>x=7</span><span>x=7</span></span>Ответ:<span><span>(<span>7;1</span>)</span><span><span>(<span>7;1</span>)</span><span> </span></span></span>