Graphical Inequalities and Regions
Graphical inequalities show up as shaded regions on coordinate planes, and they're actually quite straightforward once you know the rules. Solid lines mean ≤ or ≥, whilst dashed lines mean < or >.
For linear inequalities like y ≤ 2x, first draw the line y = 2x, then shade below it (since you want y values less than or equal to 2x). When you have multiple inequalities like y ≤ 2x, y ≥ 1, and y + x ≤ 3, the solution region is where all shaded areas overlap.
Quadratic inequalities work similarly. For y ≥ x² - 2x - 8, sketch the parabola first, then shade above it since you want y values greater than the quadratic expression.
Visual Check: Pick a point inside your shaded region and substitute into all inequalities – if they're all satisfied, you've got it right!