Answer: A test point such as the origin.
- A A protractor to measure the boundary angle
- B A test point such as the origin
- C The slope of the line, considered by itself
- D Trial and error without any systematic method
Correct answer: B. A test point such as the origin
Explanation: A convenient test point (often the origin, if not on the line) is substituted into the inequality to see which half-plane satisfies it.
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.