Posted by caduceus on Sunday, November 10, 2013 at 10:11pm.
Which choice could be the equation of a line perpendicular to the line represented by this equation?
y = 5
for this question, i put this:
y = 1/5x
but, it says i am wrong. how is that? 5 is 5/1, and so the negative reciprocal of 5/1 would be 1/5, right?

algebra  Anonymous, Sunday, November 10, 2013 at 10:19pm
You are correct. Maybe they anticipated
(1/5)*x, or x/5, or 0.2x, or maybe they are just wrong.

algebra  Reiny, Sunday, November 10, 2013 at 10:25pm
y = 5 or y = 0x + 5
is a horizontal line with slope of 0
Thus a perpendicular line would be a vertical line, which has an undefined slope.
Any vertical line has the form x = k , where k is a constant
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