Linear combinations and linear independence

What values for $c_1$ and $c_2$ make the following equation true?

$c_1\begin{pmatrix} 2 \\ 4 \end{pmatrix} +c_2 \begin{pmatrix} 2 \\ 3 \end{pmatrix} = \begin{pmatrix} 0 \\ 0 \end{pmatrix}$

List the values separated by a space.