8. (20%) Find all integer solutions for $x$ and $y$ such that $x \equiv 2 \pmod{3}$, $x \equiv 4 \pmod{5}$, $x \equiv 6 \pmod{7}$ and $y \equiv 4 \pmod{15}$, $y \equiv 7 \pmod{21}$, $y \equiv 14 \pmod{35}$.