PSAT Math Multiple-Choice Question 190: Answer and Explanation
Question: 190
The solution to which inequality is represented in the graph above?
- A.
- B.
- C.
- D.
Correct Answer: A
Explanation:
A
Difficulty: Medium
Category: Heart of Algebra/Inequalities
Getting to the Answer: Don't answer this question too quickly. The shading is below the line, but that does not necessarily mean that the symbol in the equation will be the less than symbol (<). Start by writing the equation of the dashed line shown in the graph in slope-intercept form. Then, use the shading to determine the correct inequality symbol. The slope of the line shown in the graph is and the y-intercept is - 3, so the equation of the dashed line is
. The graph is shaded below the boundary line, so use the < symbol. When written in slope-intercept form, the inequality is
. The inequalities in the answer choices are given in standard form (Ax + By = C), so rewrite your answer in this form. Don't forget to reverse the inequality symbol if you multiply or divide by a negative number:
Choice (A) is correct.
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