Brainlag PlusSolve inequalities like equations, reverse the sign when you divide by a negative, show and list the solutions, and describe regions on a graph.
Solve like an equation
Most steps are the same as for an equation: 3x + 5 < 20 gives 3x < 15, so x < 5.
The one difference: multiplying or dividing by a negative number reverses the sign. 10 − 2x ≥ 4 gives −2x ≥ −6, so x ≤ 3. (Check: x = 0 works, and 0 ≤ 3.)
The rest of this lesson and its 9 practice questions are in Plus.
Screen 1 of 4, free to read.
- 9 exam-style questions, marked as you go, each with a worked solution
- The Equation Solver beside every question
- Anything you get wrong is saved to your flashcards