Use the addition method to solve the following system of two linear equations.\\
$\begin{cases} -6x + 2y = -\frac{5}{2} \\ 9x - 3y = \frac{15}{4} \end{cases}$\\Write the solution as an ordered pair. For parametric solutions use either $x = t$ or $y = t$ as the parameter. (If an answer does not exist, enter DNE.)\\$(x, y) = \boxed{DNE}$