Graficando desigualdades 2

Más lecciones gratuitas en: http://es.khanacademy.org/video?v=2ClsQDIKB54 Graphing Inequalities 2 link al video original: https://www.khanacademy.org/math/algebra/linear-equations-and-inequalitie/graphing-linear-inequalities/v/graphing-inequalities-2