____ ____ ____ ____ ?
过点P(x,y)的直线分别与x轴和y轴的正半轴交于A,B两点,点Q与点P关于y轴对称,O为坐标原点,若BP→=2PA→且OQ→·AB→=1,则点P的轨迹方程是( )
——Will you join us to play basketball on Saturday afternoon?
——________, but I promised to go swimming with Eric.