math
posted by Bridget .
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)

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 
Slope is 5
Parallel is 5 or 1/5
Perpendicular is 5 
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"