graphing
Plot inequalities online in Graph Lab
Graph Lab shades inequality regions from expressions like y < 2x + 1 so you can sketch feasible sets without a Classroom account—open the demo, then edit boundaries for homework.
By UtilBloom · Published 2026-10-12 · Updated 2026-10-12
The problem
Algebra homework often asks you to graph a half-plane or the intersection of two inequalities. A numeric inequality solver returns interval text; you still need a shaded picture for the report. Handheld calculators make shading awkward on a projector.
How to shade in Graph Lab
Open Graph Lab and type an inequality row such as y < 2x + 1. Add a second row like y > -x + 2 to see the overlapping feasible set. Pan and zoom until the boundary lines and shaded region fill the frame. Open the inequality shading demo to start with both constraints already loaded.
When Desmos or the classic calculator is better
Keep Desmos Classroom if the assignment is an Activity Builder with teacher pacing. Use /math/inequality-solver when you only need interval notation for one variable, then plot here. For a single y = f(x) curve without shading, stay on /math/graphing-calculator.
Tips for clean screenshots
Toggle grid clarity, use contrasting colors per row, and label axes with units before you capture. Paste the inequality text into your write-up so graders can reproduce the region without the PNG alone.
FAQ
Does Graph Lab support strict and non-strict inequalities?
Enter forms with <, >, ≤, or ≥ as the parser accepts; if a symbol fails, rewrite with < = or > = ASCII-style and retry.
Can I graph x < 3 style vertical bands?
Yes when the expression classifies as an inequality in x or y. Split awkward forms into multiple rows if sampling looks sparse.
Will shading upload my work?
No—evaluation stays in the browser. Share links encode the document in the URL hash.