Which of the following equations describes a line that is perpendicular to y=x+5?
Choose the correct choice from the following
A) y = x − 5
B) y = −1 − x
C) y = 5x
D) y = 5x+1
E) y = 1/x + 5
Two perpendicular lines have slopes that are inverse reciprocals of each other.   The slope of y=x+5 is 1 so the slope of a perpendicular line will be -1.   The answer is y = −1 − x.
<result>B</result>
Which of the following equations describes a line that is perpendicular to y=x+5?