點(diǎn)(4，0)關(guān)于直線5x+4y+21=0對(duì)稱的點(diǎn)是

1. A.
   (-6，8)
2. B.
   (-8，-6)
3. C.
   (6，8)
4. D.
   (-6，-8)

點(diǎn)(4，0)關(guān)于直線5x＋4y＋21=0的對(duì)稱點(diǎn)的坐標(biāo)是

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點(diǎn)(4，0)關(guān)于直線5x＋4y＋21=0的對(duì)稱點(diǎn)的坐標(biāo)是

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點(diǎn)(4，0)關(guān)于直線5x＋4y＋21=0對(duì)稱的點(diǎn)是

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點(diǎn)(4，0)關(guān)于直線x＋y－1=0的對(duì)稱點(diǎn)是(________,_______)．