









MARKING YOUR GRAPH
ARROWS are used when marking several overlapping regions. Thus, the graph at the right marks the interior of the circle with center (0,0) and radius 1, which solves the inequality " x^{2} + y^{2} 1 ".  

SOLID SHADING is used in the final answers to problems, or where there is only ONE region being shaded. Use the side of your pencil, or in some way completely fill up the visible portion of the space being marked, as at the right. 
Practice these ideas with a selftest ? 



