Use the calculator to check textbook exercises, classroom examples, and quick tutoring demos. Share links preserve the selected mode and coefficients so students and colleagues can revisit the same inequality setup.
Results
Number line
Plane view
Teacher notes
FAQ
Which inequality types does this solver support?
The calculator covers linear, compound, absolute value, quadratic, and rational one-variable inequalities, plus half-planes and systems in two variables. Each mode explains every algebraic step and visualises intervals or polygons.
How are strict inequalities shown on the graphs?
Open endpoints and dashed boundaries appear automatically when you choose < or >. Non-strict operators close the endpoint and switch boundaries to solid lines so you can distinguish included points at a glance.