Answer: x < 4.
- A x < 4
- B x < 12
- C x > 4
- D x < -4
Correct answer: A. x < 4
Explanation: 3x < 12, so x < 4 by dividing both sides by the positive number 3.
One-variable inequalities use open (excluded) or closed (included) circles on a number line; two-variable inequalities use a dashed (strict) or solid (non-strict) boundary line, with the solution being the entire shaded half-plane on one side of it.
Concept context
Solving linear inequalities in one and two variables algebraically and graphically, and representing solutions on a number line or as a region in a plane.