Skill: linear-inequalities
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Number-Line Lab
Drag the boundary dot, flip open/closed, and switch the shading direction — then connect every graph back to the algebra that made it.
Number-line explorer
shaded = solution set
open circle = strict (<, >)
closed dot = ≤, ≥
open circle = strict (<, >)
closed dot = ≤, ≥
x > 3 — open circle at 3, shade right
Solve it, then graph it
Enter an inequality — the lab solves it (watch for the flip) and sets the graph.
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Challenges
Graph: x > 3
Set the boundary, the dot, and the direction on the explorer, then press Check.
Predict the flip
For −3x ≤ 18: will the sign flip when you solve? Type the final inequality and press Check.
Check