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【简答题】
直线PA是一次函数y=x+n（n＞0）的图象，直线PB是一次函数y=-2x+m（m＞n）的图象，PA与y轴 交于Q点（如图所示），若四边形PQOB的面积是 5 6 ，AB=2． （1）用m或n表示A、B、Q、三点的坐标； （2）求A、B两点的坐标； （3）求直线PA与PB的解析式．
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