Which of the following equations describes a line that is perpendicular to y = x/2 + 6?	Choose the correct answer.
A) y = x − 6  B) y = −1 − 2x  C) y = -3x  D) y = 6x-1  E) y = 1/x + 6
Two perpendicular lines have slopes that are inverse reciprocals of each other.   The slope of y = x/2 + 6 is 1/2 so the slope of a perpendicular line will be -2.   The answer is y = −1 − 2x.
<result>B</result>
Which of the following equations describes a line that is perpendicular to y = x/2 + 6?