Posted by **Bridget** on Monday, November 4, 2013 at 3:53pm.

Find the slope of the lines that are (a) parallel lines (b) perpendicular lines to the lines passing through the pair of points (3, 4)(2,-1)

- math -
**Reiny**, Monday, November 4, 2013 at 4:05pm
Find the slope of the line joining your two given points (you should know how to do that)

A line parallel will have the same slope

A line perpendicular will have a slope which is the negative reciprocal of the given slope

let me know what you get

- math -
**Bridget**, Monday, November 4, 2013 at 4:21pm
Slope is 5

Parallel is 5 or 1/5

Perpendicular is -5

- math -
**Reiny**, Monday, November 4, 2013 at 4:49pm
your slope of the given line is correct as 5

Then a parallel line also has a slope of 5

a perpendicular line will have slope of -1/5

your statement of

"Parallel is 5 or 1/5" is illogical.

same for " perpendicular is -5" , makes no sense to me.

Perpendicular is a property, -5 is a quantity

That is like saying " funny is -5"

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