9.
如图,在边长均为\(l\)的小正方形网格纸中,\(\triangle ABC\)的顶点\(A\)、\(B\)、\(C\)均在格点上,\(O\)为直角坐标系的原点,点\(A(-1,0)\)在\(x\)轴上.
\((1)\)以\(O\)为位似中心,将\(\triangle ABC\)放大,使得放大后的\(\triangle A_{1}B_{1}C_{1}\)与\(\triangle ABC\)的相似比为\(2\):\(1\),要求所画\(\triangle A_{1}B_{1}C_{1}\)与\(\triangle ABC\)在原点两侧;
\((2)\)分别写出\(B_{1}\)、\(C_{1}\)的坐标.