如图，直线y=kx+6分别与x轴、y轴相交于点E和点F，点E的坐标为（-8，0），点A的坐标为（0，6）。（1）求k的值；（2）若点P（x，y）是第二象限内的直线上的一个动点，当点P运动过程中，试-八

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