Master vertex placement, line style (dashed vs. solid), direction of opening, test point evaluation, and shaded region identification for absolute value inequalities.
Key Concepts Covered:
Vertex $(h, k)$: For $y \le a|x - h| + k$, the vertex (turn point) is located at $(h, k)$.
Boundary Lines: Strict inequalities ($<, >$) use dashed lines; inclusive inequalities ($\le, \ge$) use solid lines.
Shading Directions: Greater than ($>, \ge$) shades above/inside an upward V; less than ($<, \le$) shades below/outside an upward V.