PSAT Math Grid-Ins Question 102: Answer and Explanation
Question: 102
The function f(x) = –3x – 2 is graphed in the xy-plane. Line b is perpendicular to function f. What is the slope of line b?
Correct Answer: 
Explanation:
The question asks for the slope of a line perpendicular to the graph of a linear equation. Perpendicular lines have negative reciprocal slopes. The equation, f(x) = –3x – 2, is given in y = mx + b form, in which m is the slope. The slope of f(x) is –3. Since line b is perpendicular to f(x), its slope is 
. The correct answer is 
.
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