[tex]\displaystyle\bf\\p(1 \ ; \ -2) \ \ , \ \ q(3 \ ; \ -1)\\\\3p\Big(3\cdot 1 \ ; \ 3\cdot(-2)\Big)=(3 \ ; \ -6)\\\\2q\Big(2\cdot 3 \ ; \ 2\cdot(-1)\Big)=(6 \ ; \ -2)\\\\m=3p-2q=\Big(3-6 \ ; \ -6-(-4)-2)\Big)=(-3 \ ; \ -4)\\\\\\|m|=\sqrt{(-3)^{2} +(-4)^{2} } =\sqrt{9+16} =\sqrt{25} =5\\\\\\Otvet \ : \ |m|=5[/tex]