[tex]~~~~~~~~~~~~\textit{distance between 2 points} \\\\ R(\stackrel{x_1}{-2}~,~\stackrel{y_1}{-4})\qquad S(\stackrel{x_2}{-8}~,~\stackrel{y_2}{-6})\qquad \qquad d = \sqrt{( x_2- x_1)^2 + ( y_2- y_1)^2} \\\\\\ RS=\sqrt{[-8 - (-2)]^2 + [-6 - (-4)]^2}\implies RS=\sqrt{(-8+2)^2+(-6+4)^2} \\\\\\ RS=\sqrt{(-6)^2+(-2)^2}\implies RS=\sqrt{40}\implies RS\approx 6.3[/tex]
