Question

СРОЧНО!!!!!!!!!!!!!! НОМЕР 692!!!!!

Answer 1

$A(-5,6)\; ,\; B(7,2)\; ,\; C(5,1)\; ,\; D(-4,4)\\\\a)\; \; \overline {AB}=(12,-4)\; ,\; \; \overline {CD}=(-9,3)\\\\\frac{12}{-9}=\frac{-4}{3}\\\\-\frac{4}{3}=-\frac{4}{3}\; \; \to \; \; \overline {AB}||\overline {CD}\\\\b)\; \; \overline {BC}=(-2,-1)\; \; ,\; \; \overline { AD}=(1,-2)\\\\\frac{-2}{1}\ne \frac{-1}{-2}\\\\-2\ne \frac{1}{2}\; \; \to \; \; \overline {BC}\; \; ne||\; \;  \overline {AD}$