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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