Graphing quadratic inequalities in two variables

Lessons

1. Graphing Quadratic Inequalities of Parabolas Opening Up
   Graph:
   i) $y = \frac{1}{3}{x^2} - \frac{2}{3}x - \frac{8}{3}$
   ii) $y \ge \frac{1}{3}{x^2} - \frac{2}{3}x - \frac{8}{3}$
   iii) $y$ < $\frac{1}{3}{x^2} - \frac{2}{3}x - \frac{8}{3}$
   
2. Graphing Quadratic Inequalities of Parabolas Opening Down
   Graph:
   i) $y = - {x^2} - 4x$
   ii) $y$ > $- {x^2} - 4x$
   iii) $y \le - {x^2} - 4x$