A.\( \overrightarrow{e}_{1}=(0,0), \overrightarrow{e}_{2}=(-2,1)\) |
B.\( \overrightarrow{e}_{1}=(4,6), \overrightarrow{e}_{2}=(6,9)\) |
C.\( \overrightarrow{e}_{1}=(2,-5), \overrightarrow{e}_{2}=(-6,4)\) |
D.\( \overrightarrow{e}_{1}=(2,-3), \overrightarrow{e}_{2}=( \dfrac {1}{2},- \dfrac {3}{4})\) |