Which of the following equations describes a line that is perpendicular to y=x-7?	Choose the most appropriate option:
A) y = x + 7 B) y = −5 − x C) y = 7x D) y = 7x+1 E) y = 1/x - 7
Two perpendicular lines have slopes that are inverse reciprocals of each other.   The slope of y=x-7 is 1 so the slope of a perpendicular line will be -1.   The answer is y = −5 − x.
<result>B</result>
Which of the following equations describes a line that is perpendicular to y=x-7?