(1)在同一平面直角坐标系中,分别作出一次函数y=3x+4,y=3x-2,y=x+1,y=x-3的图像,(2)观察上述图象,试说出上述4个函数的图象所围成的图形有什么特征;(3)写出4条直线的交点的坐标.
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![(1)在同一平面直角坐标系中,分别作出一次函数y=3x+4,y=3x-2,y=x+1,y=x-3的图像,(2)观察上述图象,试说出上述4个函数的图象所围成的图形有什么特征;(3)写出4条直线的交点的坐标.](/uploads/image/z/3028113-9-3.jpg?t=%281%29%E5%9C%A8%E5%90%8C%E4%B8%80%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2C%E5%88%86%E5%88%AB%E4%BD%9C%E5%87%BA%E4%B8%80%E6%AC%A1%E5%87%BD%E6%95%B0y%3D3x%2B4%2Cy%3D3x-2%2Cy%3Dx%2B1%2Cy%3Dx-3%E7%9A%84%E5%9B%BE%E5%83%8F%2C%282%29%E8%A7%82%E5%AF%9F%E4%B8%8A%E8%BF%B0%E5%9B%BE%E8%B1%A1%2C%E8%AF%95%E8%AF%B4%E5%87%BA%E4%B8%8A%E8%BF%B04%E4%B8%AA%E5%87%BD%E6%95%B0%E7%9A%84%E5%9B%BE%E8%B1%A1%E6%89%80%E5%9B%B4%E6%88%90%E7%9A%84%E5%9B%BE%E5%BD%A2%E6%9C%89%E4%BB%80%E4%B9%88%E7%89%B9%E5%BE%81%3B%EF%BC%883%EF%BC%89%E5%86%99%E5%87%BA4%E6%9D%A1%E7%9B%B4%E7%BA%BF%E7%9A%84%E4%BA%A4%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87.)
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