SOLUTION: Determine which two equations represent perpendicular lines. (a) y = 9x – 5 (b) y = x + 5 (c) y = –3x + 5 (d) y = x – 5

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Question 107800: Determine which two equations represent perpendicular lines.
(a) y = 9x – 5
(b) y = x + 5
(c) y = –3x + 5
(d) y = x – 5

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
FOR A LINE TO BE PERPENDICULAR IT MUST HAVE A SLOPE=THE NEGATIVE RECIPRICAL TO ANOTHER LINE.
THE NEGATIVE RECIPRICAL OF 9 IS -1/9
THE NEGATIVE RECIPRICAL OF 1=-1
THE NEGATIVE RECIPRICAL OF -3 IS 1/3
THEREFORE NONE OF THESE CHOICES MEET THE REQUIREMENTS.