6.
已知直线\(l: \begin{cases} x=1+ \dfrac { \sqrt {2}}{2}t \\ y= \dfrac { \sqrt {2}}{2}t\end{cases}(t\)为参数\()\),曲线\(C_{1}: \begin{cases} x=2\cos θ \\ y= \sqrt {3}\sin θ\end{cases}(θ\)为参数\()\)
\((1)\)求直线\(l\)与曲线\(C_{1}\)的普通方程;
\((2)\)已知点\(F(1,0)\),\(F_{1}(-1,0)\),若直线\(l\)与曲线\(C_{1}\)相交于\(A\),\(B\)两点\((\)点\(A\)在点\(B\)的上方\()\),求\(|F_{1}A|-|F_{1}B|\)的值.