SSAT Math Question 288: Answer and Explanation
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Question: 288
2. The slope of the line that is perpendicular to the line 4x + 5y = 10 is
- A. -
- B. -
- C. -
- D.
Correct Answer: D
Explanation:
The answer is D
Manipulate the equation into y = mx + b form, by subtracting 4x from both sides and dividing both sides by 5: y = -x + 2. The slope of a line perpendicular to another line is the negative reciprocal of the other line's slope. Slope is represented by m in the equation y = mx + b. In this case, the slope of the given line is -. Thus, the slope of the perpendicular line is .