If $\overline{\mathrm{p}} =(3,-1,5), \overline{\mathrm{q}} =(1,2,-3)$. A vector $\overline{\mathrm{r}}$ is such that it is perpendicular to Z-axis and satisfies the conditions $\overline{\mathrm{r}}.\overline{\mathrm{p}} = 9, \overline{\mathrm{r}}.\overline{\mathrm{q}} = -4,$ then $\overline{\mathrm{r}}=$