Номер 5 и 6 помогите плиз

Решите задачу:

$1)\quad (\sqrt5-\sqrt7)x\ \textless \ \frac{10}{\sqrt5+\sqrt7}\; \; \Big |:(\sqrt5-\sqrt7)\\\\\sqrt5-\sqrt7\ \textless \ 0\; \; \Rightarrow \; \; x\ \textgreater \ \frac{10}{(\sqrt5+\sqrt7)(\sqrt5-\sqrt7)} \\\\x\ \textgreater \ \frac{10}{5-7}\\\\x\ \textgreater \ -5\\\\x\in (-5,+\infty )$

$2)\quad \left \{ {{\frac{4}{3x-y}=-0,5} \atop {0,6x-y=-3,2}} \right. \; \left \{ {{4=-\frac{1}{2}(3x-y)} \atop {\frac{3}{5}x-y=-\frac{16}{5}\, |\cdot 5}} \right. \; \left \{ {{8=-3x+y } \atop {3x-5y=-16}} \right. \\\\\\ \left \{ {{-3x+y=8} \atop {3x-5y=-16}} \right. \oplus \; \left \{ {{-3x+y=8} \atop {-4y=-8}} \right. \; \left \{ {{-3x+2=8} \atop {y=2}} \right. \; \left \{ {{-3x=6} \atop {y=2}} \right. \; \left \{ {{x=-2} \atop {y=2}} \right. \\\\Otvet:\; \; (-2;2)\; .$