SOLUTION: p= -(1,2) r= (2,4) what is the slope of pr? what is the slop of the line perpendicular to pr? pr=? please help!

Algebra ->  Angles -> SOLUTION: p= -(1,2) r= (2,4) what is the slope of pr? what is the slop of the line perpendicular to pr? pr=? please help!      Log On


   

Question 827745: p= -(1,2)
r= (2,4)
what is the slope of pr?
what is the slop of the line perpendicular to pr?
pr=?

please help!
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
What is this? p= -(1,2)
Do you mean this: p=(-1,-2) ?

Assuming so, slope is vertical change divided by horizontal change.
Let this slope be m.
m=%28-2-4%29%2F%28-1-2%29=3

Let m%5Bo%5D = the slope for a line perpendicular to the line of slope m.
m%2Am%5Bo%5D=-1
3%2Am%5Bo%5D=-1
Find m%5Bo%5D.