2.如圖,直線l
1經(jīng)過點(diǎn)A(6,0),且垂直于x軸,直線l
2:y=kx+b(b>0)經(jīng)過點(diǎn)B(-2,0),與l
1交于點(diǎn)C,S
△ABC=16.點(diǎn)M是線段AC上一點(diǎn),直線MN∥x軸,交l
2于點(diǎn)N,D是MN的中點(diǎn),雙曲線y=
(x>0)經(jīng)過點(diǎn)D,與l
1交于點(diǎn)E.
(1)求l
2的解析式;
(2)當(dāng)點(diǎn)M是AC中點(diǎn)時(shí),求點(diǎn)E的坐標(biāo);
(3)當(dāng)MD=1時(shí),求m的值;
(4)在x軸上存在點(diǎn)P,使得△BCP是等腰三角形,請(qǐng)直接寫出點(diǎn)P的坐標(biāo).