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【简答题】
在直角坐标系中,横、纵坐标都为整数的点叫做整点。设坐标轴的单位长为1cm,整点P从原点O出发,速度为1cm/秒,且点P只能向上或向右运动。 请回答下列问题: (1)填表: P从O出发的时间 可以得到的整点的坐标 可以得到的整点的个数 1秒 (0,1)、(1,0) 2 2秒 (2,0)、(0,2)、(     ) 3 3秒 (3,0)、(2,1)、(0,3)、(     ) 4 (2)当点P从点O出发10秒时,可得到的整点个数是 个; (3)当点P从O点出发 秒时,可得到整点(10,5); (4)当点P从点O出发30秒时,整点P恰好在直线y=2x-6上,请求P点坐标。
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