Question

7．己知點(diǎn)P的坐標(biāo)為（2，-3），若點(diǎn)Q與點(diǎn)P關(guān)于y軸對(duì)稱，則點(diǎn)Q的坐標(biāo)為（-2，3）．

Answer 1

分析 關(guān)于y軸對(duì)稱的點(diǎn)，縱坐標(biāo)相同，橫坐標(biāo)互為相反數(shù)，可得答案．

解答 解：點(diǎn)P的坐標(biāo)為（2，-3），若點(diǎn)Q與點(diǎn)P關(guān)于y軸對(duì)稱，則點(diǎn)Q的坐標(biāo)為（-2，3），
故答案為：（-2，-3）．

點(diǎn)評(píng) 本題考查了關(guān)于y軸對(duì)稱的點(diǎn)的坐標(biāo)，解決本題的關(guān)鍵是掌握好對(duì)稱點(diǎn)的坐標(biāo)規(guī)律：關(guān)于x軸對(duì)稱的點(diǎn)，橫坐標(biāo)相同，縱坐標(biāo)互為相反數(shù)；關(guān)于y軸對(duì)稱的點(diǎn)，縱坐標(biāo)相同，橫坐標(biāo)互為相反數(shù)；關(guān)于原點(diǎn)對(duì)稱的點(diǎn)，橫坐標(biāo)與縱坐標(biāo)都互為相反數(shù)．