Хочешь,могу подробнее написать
√085-(0,6)²=√0.85-0.36=√0.49=0.7
<span>![\left \{ {{x+3y=-12} \atop {4x-6y=-12}} \right.](https://tex.z-dn.net/?f=%5Cleft+%5C%7B+%7B%7Bx%2B3y%3D-12%7D+%5Catop+%7B4x-6y%3D-12%7D%7D+%5Cright.)
</span>
<span>
x+3y=-12
</span>
y=-x/3-4
4x-6y=-12
4x-6*(-x/3-4)=-12
4x+2x+24+12=0
6x+24+12=0
6x+36=0
x=-36/6
x=-6
x+3y=-12
(-6)+3y=-12
6+3y=0
y=-6/3
y=-2
Ответ: x=-6; y=-2.
..........................