Equations ask "what equals this?" — inequalities ask "what's allowed?" That shift changes everything about the answer: instead of one or two solutions, you get a whole range. The inequality 2x + 3 < 11 doesn't have a single answer; it has an infinite family, every x less than 4. Budget problems live here ("I can spend at most $50"), as do speed limits, age restrictions, and every SAT question containing the words "at least" or "no more than." If equations are destinations, inequalities are the neighborhoods you're permitted to live in.

Solving them feels like solving equations with one booby trap: multiplying or dividing by a negative number flips the inequality sign. Solve −2x > 8 by dividing by −2 and you must write x < −4 — forgetting the flip is the single most-tested mistake in Algebra I. This calculator checks your inequality work: enter the two values from your solving steps and confirm the computed result. Graph the answer on a number line with an open or closed circle at the boundary — open for < and >, closed for ≤ and ≥ — and shade the allowed region. That picture is worth more than the algebra, because it shows at a glance whether x < 4 includes 4 itself (it doesn't).

With the pre-filled defaults — Variable A 10, Variable B 5 — the Inequality Calculator returns Result 50.0000. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.