如图,在平面直角坐标系中,直线l:y=-4/3x+4分别交x轴、y轴于点A,B,将△AOB绕点 顺时针旋转90°后得到△A`OB`(1)求直线A'B'的解析式; (2)若直线A'B'与直线l相交于点C,求△A'BC的面积
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