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

## Answer this Question

## Related Questions

- algebra2 - Which choice could be the equation of a line perpendicular to the ...
- Math 10 - 1 more question.... how would I make this equation perpendicular? The ...
- algebra - Which choice is the equation of a line that has a y-intercept of 7 ...
- algebra - Which choice is the equation of a line that passes through the point...
- algebra - Which choice is the equation of a line that passes through the point (...
- algebra ll - Which choice is the equation of a line that passes through the ...
- Algebra - First the slope. Perpendicular to a slope of -3 means a line slope of ...
- Writing this equation - how do I write the equation of a line perpendicular to ...
- algebra - Which equation produces a line that is perpendicular to the line ...
- Algebra - What is the equation of the line that has a y-intercept of 5 and is ...