4.
已知向量\( \overrightarrow{a}=(1,0), \overrightarrow{b}=(-2,1)\).
\((1)\)若\(k \overrightarrow{a}- \overrightarrow{b}\)与\( \overrightarrow{a}+3 \overrightarrow{b}\)垂直,求\(k\)的值;
\((2)\)若\(k \overrightarrow{a}- \overrightarrow{b}\)与\( \overrightarrow{a}+3 \overrightarrow{b}\)平行,求\(k\)的值.